Coagulated milk becomes cheese thanks to the action of lactic bacteria present in the milk, which transform lactose into lactic acid, promoting the coagulation of proteins. Then, the curd is pressed and aged to give birth to cheese.
When milk curdles, it is primarily because the proteins it contains, especially casein, clump together under the action of enzymes or an acidic environment. At this stage, the milk becomes a kind of solid gel, known as curds. But at this point, it is not yet cheese as we know it: there is still a lot of water (the whey). By gradually eliminating this water, particularly through drainage and pressing, these proteins become more concentrated. Then microorganisms come into play, allowing for complex chemical reactions that give cheese specific flavors and textures. This complex biochemical process gradually transforms a simple bland and wet curd into a delicious, firm, and fragrant product.
Bacteria are the true little workers of cheese: they consume the lactose present in milk and produce lactic acid. This acid changes the texture, helps thicken the curd, and slows down the proliferation of harmful germs. But bacteria don't stop there; they also release enzymes that slowly break down the proteins in milk. This enzymatic work, by breaking these proteins, gradually develops the characteristic flavors and aromas of cheese. Without these microorganisms and enzymes, there would be no aged cheese, just soured milk without personality.
Once the milk has curdled, it still contains a lot of water (or whey). Draining is precisely what allows this water to be removed, giving the cheese its density. A poorly drained curd will produce a wetter and creamier cheese, while a well-drained curd will become dry and firm (like Parmesan, for example). Following this often comes pressing, which goes even further: by pressing on the drained curd, more whey is expelled and the cheese is densified. A well-pressed cheese will have a compact and solid texture (like Comté), while an unpressed cheese will have a softer and more open texture (like Camembert). By manipulating these two steps, cheesemakers can precisely control the final texture of the cheese.
Salting is a key step: it helps preserve the cheese (by preventing the development of harmful bacteria), but it also affects the taste and texture. Salt draws water to the surface, forming a protective crust, promoting aging, and allowing the characteristic flavors to develop gradually. Then, during aging, bacteria and enzymes quietly get to work on the proteins and fats. The result? The cheese evolves, gains character, and becomes flavorful thanks to a multitude of slow and complex chemical reactions. A young cheese will often be mild and creamy, while with proper aging, it will become firmer, more intense, and sometimes even very aromatic depending on the varieties!
To make one kilogram of hard cheese like Comté, about 12 liters of fresh milk are required! This partly explains why this type of cheese is rich in concentrated nutrients.
Cheese is actually one of the oldest processed foods known to mankind: evidence of its consumption dates back over 7,500 years, as found by archaeologists in ancient pottery!
The characteristic holes of Emmental cheese are not the result of chance: they form due to the carbon dioxide produced by certain bacteria during fermentation.
Some varieties of cheese, such as Brie or Camembert, continue to mature after being packaged, and their flavor evolves even once they arrive at your home!
The rind of cheeses develops during the aging process, due to salting, humidity, and the microorganisms present on the surface. It protects the cheese, enhances its flavors, and gives it a unique texture depending on the type of cheese (natural, bloomy, or washed).
The duration varies significantly depending on the type of cheese. Fresh cheeses like ricotta can take a few hours to a day, while aged cheeses such as cheddar or Comté may require several months or even years of maturation.
Salt helps preserve cheese by inhibiting undesirable microorganisms. It also enhances flavor, regulates the final texture, and strongly influences aging by controlling enzymatic activity.
It is difficult because lactic bacteria play a crucial role: they participate in the fermentation of lactose into lactic acid, contributing to the coagulation of milk and the final flavor of the cheese. Without these bacteria, we would only achieve a coarse coagulation with little flavor and a very different texture.
Curdled milk is simply the result of the natural or artificial coagulation of milk proteins. Yogurt is obtained through specific bacterial fermentation without drainage. Fresh cheese comes from drained and lightly pressed curdled milk, retaining a high moisture content.
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