Science: Swiss by Beemster

1. Milk Composition Variables

Milk Components

The precise milk composition used for Beemster Swiss is proprietary. However, the producer describes the milk sourced from the Beemster polder as the "richest and creamiest".1 This description, combined with the final product's "buttery" texture 2, suggests a milk high in butterfat. Typical high-quality Dutch cheesemaking milk is also noted for being rich in proteins and minerals.3

Based on the final cheese's nutritional profile (see Section 10) of approximately 32% fat and 25% protein, the milk is standardized to a specific protein-to-fat (P/F) ratio. Unlike traditional, hard Alpine cheeses like Emmental or Parmesan, which often use partially skimmed milk to achieve a very firm body, Beemster's "mellow" and "buttery" profile 2 indicates a higher retention of fat. This results in a lower P/F ratio, closer to that of a Gouda, which aligns with Beemster's Dutch cheesemaking heritage. The raw milk pH is expected to be in the typical range of $pH \text{ } 6.6–6.8$ before pasteurization.

Type of milk

The cheese is produced exclusively from 100% cow's milk.2 The cows are located in the Beemster polder in North Holland.1 While a specific breed is not cited, this region is a stronghold for Holstein-Friesian cows, which are known for high-volume milk production.

Biological Variables

The composition and flavor potential of the milk are heavily influenced by "terroir" and animal diet.

• Terroir: The Beemster polder is a 17th-century land reclamation, a UNESCO World Heritage site.3 Its unique, mineral-rich "blue clay" soil supports grasses that are chemically distinct from other regions.
• Diet: The cows are specified as "grass-fed".5 This diet, derived from the polder's nutrient-dense grasses, is high in beta-carotene (imparting a yellow hue to the fat) and unsaturated fatty acids. These fatty acids are the precursors to the volatile compounds (esters) that are ultimately responsible for the "fruity notes" 2 in the final cheese. This specific milk chemistry is the origin of the "creamiest milk" 1 and is a direct contributor to the final "buttery" texture.

Heat treatment

The milk is explicitly stated to be Pasteurized.2 This is a critical manufacturing control step, likely High-Temperature Short-Time (HTST) pasteurization (e.g., $72^{\circ}\text{C}$ for 16 seconds).7 Pasteurization eliminates the native microflora (both beneficial and detrimental) from the raw milk. This ensures safety and prevents defects from gas-blowing organisms like Clostridia. However, it also means that the cheese's final sensory profile is not derived from "wild" microbes but is instead almost entirely defined by the specific starter and adjunct cultures deliberately added by the cheesemaker.

2. Cultures and Microbiology Variables

Starter Cultures

The ingredient lists "cheese culture" 2 or "STARTER CULTURE".5 As Beemster Swiss is an "alpine style cheese" 2, it requires a high-temperature cooking step (see Section 4). This necessitates the use of a Thermophilic ("heat-loving") starter culture blend, as mesophilic cultures (used in Gouda) would not survive the scald.8 The standard thermophilic blend for Swiss-style cheeses includes 8:

• Streptococcus thermophilus: This bacterium is responsible for the initial, rapid acidification (fermentation of lactose into lactic acid) in the vat and during the early pressing stages.
• Lactobacillus helveticus or Lactobacillus delbrueckii subsp. lactis: These robust lactobacilli continue acidification at the high cooking temperatures. Critically, L. helveticus is highly proteolytic 13; during ripening, it produces enzymes (peptidases) that break down the casein protein matrix. This action is essential for developing the cheese's final texture and creating the pool of amino acids and peptides that serve as flavor precursors.

Adjunct Cultures

The defining visual and flavor characteristics of this cheese—its "characteristic eyes (holes)" and "nutty" flavor 2—are the direct result of a specific adjunct culture, which must be part of the "cheese culture".2 This organism is:

• Propionibacterium freudenreichii (likely subsp. shermanii): This bacterium is the signature organism of Swiss-style cheese.15 It functions during the ripening phase, particularly in the "warm room" (see Section 7). It possesses a unique metabolic pathway where it consumes the lactic acid (produced by the starters) and converts it into three key compounds 15:
  1. Propionic Acid: Provides the classic, sweet, "nutty" flavor profile.2
  2. Acetic Acid: Contributes the mild "tangy" flavor.2
  3. Carbon Dioxide ($CO_2$): This gas is produced slowly. As it forms, it is trapped within the elastic protein matrix of the cheese, forming the "bubbles" 2 that slowly inflate to create the characteristic "eyes".15

This single organism is directly responsible for creating the cheese's most notable sensory and visual traits.

Nonstarter Bacteria

Because the milk is pasteurized 2, the population and impact of nonstarter lactic acid bacteria (NSLAB) are minimal compared to a raw-milk cheese.18 Any surviving nonstarter microbes are likely thermotolerant lactobacilli (such as persistent L. helveticus strains) from the starter addition, which contribute to background proteolysis and flavor development during the 60-day aging period.14

3. Coagulation Variables

Rennet variables

The cheese is made using Microbial rennet.2 This is a non-animal-derived coagulant, often specified as "vegetarian rennet" 21, making the cheese suitable for vegetarians. The use of microbial rennet, likely a Fermentation-Produced Chymosin (FPC), provides high consistency and predictable enzymatic activity, which is essential for large-scale, standardized production. The amount used is dosed to achieve a firm set in 30–45 minutes.7

Setting variables

While specific parameters for Beemster are not public, the vat milk is set at a temperature consistent with thermophilic cheesemaking, typically $30^{\circ}\text{C}$ to $33^{\circ}\text{C}$ ($87^{\circ}\text{F}$ to $90^{\circ}\text{F}$).7 This temperature range is a balance, allowing the thermophilic cultures to begin activity 22 while remaining in the optimal functional range for microbial chymosin.

Acidification variables

Acidification begins with the addition of the starter cultures (Section 2). In Swiss-style production, the rate of pH drop is deliberately slow. The pH at the time of cutting the coagulum is kept relatively high, likely around $pH \text{ } 6.4–6.5$.23 This is a critical process control; a more acidic curd (lower pH) would become brittle, shattering during the high-temperature cook and leading to excessive moisture and fat loss.

4. Curd Treatment Variables

Cutting

To achieve a "semi-firm" 2 Alpine-style cheese, the coagulum must be cut into very small particles. Scientific literature on the production of high-cook, low-moisture cheeses (like Emmental and Parmesan) confirms that this requires cutting the curd into rice-grain or wheat-grain size (approximately $6 \text{ mm}$ / $1/4 \text{ inch}$ or smaller).22 This small cut size creates an enormous surface-area-to-volume ratio, which is essential for promoting rapid and extensive whey expulsion (syneresis) during the cooking phase.24

Cooking

This is the defining step of the "Alpine style".2 After cutting, the curd and whey slurry is gradually heated, or "scalded." Typical Swiss-style recipes call for raising the temperature slowly to $46^{\circ}\text{C}$ to $49^{\circ}\text{C}$ ($115^{\circ}\text{F}$ to $122^{\circ}\text{F}$).7 This high-temperature cook serves three critical functions:

1. Drying: It forces a large expulsion of whey from the curd particles, "cooking" them to the target "semi-firm" moisture level.
2. Microbial Selection: It halts the activity of any mesophilic bacteria and selects exclusively for the thermophilic starters (S. thermophilus and L. helveticus).8
3. Texture: It creates a highly elastic, plasticized curd texture. This elasticity is not optional; it is the physical property that allows the cheese to stretch and trap $CO_2$ gas during ripening to form eyes.

Given Beemster's "buttery" 2 end profile, they likely use a temperature at the lower end of this range or a shorter duration to retain slightly more moisture and milk fat than a traditional, harder Swiss cheese.

Stirring

Throughout the cutting and cooking process, the curds are stirred continuously and vigorously.22 This is essential to prevent the small, sticky, high-temperature curds from matting (fusing) prematurely in the vat, ensuring each particle is uniformly heated and dried.

Draining

After the cooking temperature is held and the curds have reached the correct firmness and $pH$ 7, stirring ceases. The curds settle to the bottom of the vat, fusing into a single mass under the warm whey. The whey is then drained, and the matted curd is cut into large blocks to be transferred to cheese hoops.

5. Salting Variables

Method

The ingredients list "salt".2 For a large-format (wheels up to 27 lbs) 26, pressed-curd cheese with a closed, non-Cheddar texture, the universally employed method is Brine Salting. After the cheese is fully pressed, it is removed from its hoop and submerged in a saturated or near-saturated ($18-23\% \text{ } NaCl$) salt brine solution.27

Details

The brine is typically chilled to $10^{\circ}\text{C}$ to $14^{\circ}\text{C}$ to slow microbial activity. The duration of brining depends on the wheel's size, but a common rule is 2-3 hours per pound of cheese.27 This process achieves several goals simultaneously: it imparts the final salt content (flavor), draws out the last of the free whey through osmosis, controls surface microorganisms, and initiates the formation of a durable rind. The final sodium content of ~529 mg per 100g (see Section 10) is a direct result of this brining step.

6. Pressing Variables

Pressing

This cheese is definitively pressed. The pressing process is fundamental to its identity.

Details

After draining, the hot, elastic curds (Section 4) are loaded into hoops.23 A schedule of gradually increasing pressure is applied over several hours. This may start at a low weight (e.g., 5-10 lbs) and incrementally increase to 45 lbs or more.23 The goal of pressing a Swiss-style cheese is to create a perfectly closed paste. It fuses all the individual curd grains into a single, dense, seamless matrix.30

This dense, non-porous structure is critical. The "eyes" in Beemster Swiss are biological 2, not mechanical. If the cheese had mechanical cracks or voids from improper pressing, the $CO_2$ produced during ripening (Section 7) would simply escape through these channels. By creating a fully consolidated and elastic paste, the pressing process ensures that the $CO_2$ gas is trapped, forcing it to form the distinct, spherical "eyes" that are the cheese's signature.20

7. Ripening & Aging Variables

Environmental

The ripening of Beemster Swiss is a complex, multi-stage process that is essential for eye and flavor development. While traditional cheese is aged in a cold cellar, the "bubbles form" 2 from Propionibacterium 15 only when the cheese is warmed.16 This necessitates a specific three-stage environmental profile:

1. Stage 1: Cold Room (Initial Phase): After brining, the cheese is moved to a "cave" at approximately $10^{\circ}\text{C}$ to $13^{\circ}\text{C}$ ($50^{\circ}\text{F}$ to $55^{\circ}\text{F}$) with high humidity ($80-85\%$).25 This lasts for 1–3 weeks, allowing the brine to equilibrate and the rind to stabilize.
2. Stage 2: Warm Room (Propionic Fermentation): The cheese is transferred to a "warm room" at $21^{\circ}\text{C}$ to $24^{\circ}\text{C}$ ($70^{\circ}\text{F}$ to $75^{\circ}\text{F}$) for 2–4 weeks.15 This higher temperature "activates" the Propionibacterium freudenreichii (Section 2). This is the stage where the "bubbles form" 2; the cheese visibly swells as $CO_2$ is produced and the "nutty" (propionic acid) and "tangy" (acetic acid) flavors develop.
3. Stage 3: Cold Room (Maturation): Once the desired eye formation is achieved, the cheese is moved back to the cold room ($10-13^{\circ}\text{C}$) 25 to halt the propionic fermentation and allow the cheese to mature and flavors to integrate.

Time variables

The total aging time is specified as a minimum of 60 days.2 This is a relatively short maturation period for an Alpine-style cheese, which can often be aged for 6-12 months or more.23 This short aging is the primary variable responsible for the cheese's "Mellow" 32 and "Mild" 2 flavor profile, making it more approachable than a traditional, sharp Emmental.

Microbial / Biochemical Reactions

During the 60-day, three-stage ripening, several key reactions occur simultaneously:

• Propionic Fermentation (Stage 2): As detailed above, the Propionibacterium metabolizes lactate into propionic acid, acetic acid, and $CO_2$.15 This is the primary reaction defining the cheese's character.
• Proteolysis (All Stages): Enzymes from the Lactobacillus helveticus starter 13 and, to a lesser extent, the microbial rennet, continuously break down the complex casein protein network. This softens the cheese body and releases amino acids, which act as flavor precursors and contribute to umami.
• Lipolysis (All Stages): Lipases, both from the milk and the microflora, break down the milk fat (lipolysis). This releases free fatty acids. These fatty acids, particularly those from the "grass-fed" milk 5, react with alcohols (from fermentation) to form esters, the class of volatile compounds responsible for the "fruity notes".2

8. Melt and Cooking Behavior Variables

Analysis

The producer explicitly recommends Beemster Swiss for cooking applications where melt is key, including "fondue," "Reuben sandwiches," "mac-n-cheese," and "grilled cheese".2 This excellent melting behavior is a direct, predictable result of the cheese's chemical composition:

• pH: During ripening, the Propionibacterium consumes lactic acid, which raises the final $pH$ of the cheese (e.g., to $pH \text{ } 5.2–5.4$). This relatively high $pH$ (low acidity) keeps the casein proteins more soluble and less prone to aggregation, resulting in a smooth, flowing melt that resists clumping or stringiness.
• Moisture-to-Fat (M:F) Ratio: The cheese's classification as "semi-firm" 2 (rather than "hard") and "buttery" 2 implies a moderate moisture content 33 and a high fat content. The fat (Section 1) acts as a lubricant, promoting flow, while the moisture allows the protein matrix to become fluid when heated.
• Calcium Content: The high-temperature cook (Section 4) and controlled acidification (Section 3) help to solubilize some of the colloidal calcium phosphate "glue" that binds the casein matrix. This weakening of the internal structure is essential to allow the proteins to flow freely upon heating.

Uses

Based on this analysis, the cheese is an ideal melting cheese. It provides excellent flow and coverage for hot applications, delivering a mild, nutty, and tangy flavor profile that complements other ingredients without overpowering them.

9. Sensory Evaluation Variables

Texture

The texture is described as "Semi-firm, buttery" 2 and "smooth".5 These characteristics are a direct synthesis of the production process:

• "Semi-firm" is the result of the high-temperature "Alpine" cook (Section 4).
• "Buttery" is the result of the high-fat, "creamiest" Beemster polder milk (Section 1).
• "Smooth" is the result of the effective pressing (Section 6) that creates a dense, closed paste.

Flavor & Aroma

The flavor profile is "Mild, tangy and nutty with fruity notes" 2, and the cheese is classified as "Mellow".2 This profile is a perfect map of its underlying biochemistry:

• Mild / Mellow: A direct result of the short, "min. 60 days" aging period (Section 7).
• Tangy: Derived from the acetic acid produced by Propionibacterium (Sections 2 & 7).
• Nutty: Derived from the propionic acid produced by Propionibacterium (Sections 2 & 7).15
• Fruity: Derived from esters formed via lipolysis of the grass-fed milk fat (Sections 1 & 7).

Visual

The primary visual characteristic is the presence of "characteristic eyes (holes)".2 These eyes are the visual proof of the entire Swiss-style process: the Propionibacterium freudenreichii culture (Section 2) was successfully activated in a "warm room" (Section 7) to produce $CO_2$ gas 15, which was then successfully trapped by the elastic, well-pressed (Section 6) curd matrix created by the thermophilic cultures and high-cook (Section 4). The paste color is a light, buttery yellow, consistent with the beta-carotene in the grass-fed milk.5

10. Nutritional Information

The following nutritional information is synthesized and corrected from distributor-level data sheets. Several sources 5 contain clear typographical errors (e.g., "0G" Total Fat, "529G" Sodium). The panel below reconciles these errors by cross-referencing with reliable per-serving data 35 and scaling to a 100g standard, which confirms, for example, that "529G" was intended to be "529mg."

Nutrition Facts for Beemster Swiss (Synthesized Panel)
Serving Size: 100g

| Component | Amount per 100g | % Daily Value (DV)* | | :---- | :---- | :---- | | Calories | 377 | | | Total Fat | 32.1 g | 41% | | Saturated Fat | 22.2 g | 111% | | Trans Fat | 0 g | | | Cholesterol | 80 mg | 27% | | Sodium | 529 mg | 23% | | Total Carbohydrate | 0 g | 0% | | Dietary Fiber | 0 g | 0% | | Total Sugars | 0 g | | | Includes Added Sugars | 0 g | 0% | | Protein | 24.9 g | | | Vitamin D | 0.30 mcg | 2% | | Calcium | 792 mg | 61% | | Iron | 0.2 mg | 1% | | Potassium | 77 mg | 2% |

Data derived from.5 Percent Daily Values are based on a 2,000 calorie diet.

The 0g of total sugars is expected, as the lactose (milk sugar) is completely consumed by the thermophilic and propionic cultures during fermentation and ripening.

Concluding Summary: Key Variable Integration

The scientific analysis of Beemster Swiss reveals it to be a deliberately engineered Dutch-Alpine hybrid cheese. Its unique "mellow" and "buttery" 2 character is not a simple variation of a traditional Swiss Emmental, but a fusion of two distinct cheesemaking philosophies.

This cheese's identity is built from two core components:

1. A Dutch-Style Raw Material: The foundation is the "richest and creamiest" milk 1 from "grass-fed" cows 5 in the Beemster polder. This high-fat, mineral-rich milk (Section 1) provides the buttery texture and "fruity" (ester) notes that are characteristic of Beemster's renowned Goudas.
2. A Swiss-Style Process: This Dutch-style milk is then subjected to a rigorous Alpine manufacturing process. This includes the use of a thermophilic starter culture (Section 2), a high-temperature "scalding" cook (Section 4) to create an elastic paste, and the critical addition of Propionibacterium freudenreichii (Section 2).

The final character is achieved in a three-stage cold-warm-cold ripening process (Section 7). The "warm room" phase activates the Propionibacterium to produce $CO_2$ (forming the "eyes"), propionic acid (the "nutty" flavor), and acetic acid (the "tangy" flavor).2 Finally, the short 60-day aging (Section 7) arrests this development, "freezing" the cheese in a "Mild" 2 state, where the complex Swiss-style flavors are present but not sharp or overpowering.

In conclusion, Beemster Swiss is a scientific success in product design, leveraging its core Dutch asset (high-fat polder milk) as the "body" for a Swiss-style fermentation "engine." The result is a product that retains the approachable, buttery texture of a Gouda while delivering the iconic visual and flavor notes of a Swiss cheese.

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