Cheese is essentially milk that has been separated into curds and then aged.

The longer version

Cheesemaking starts by encouraging milk proteins, mainly casein, to clump together. An acid or a coagulating enzyme makes the casein lose the charge that keeps it dispersed, so the proteins link into a gel and trap fat and water. Cutting that gel releases liquid whey and leaves solid curds.

The final texture depends on how finely the curd was cut and how much moisture was driven off. Salt is added for flavor and to slow unwanted microbes. During aging, enzymes from the starter, the milk, or added molds break proteins and fats into smaller molecules, producing the aromas associated with aged cheese.

Where this entry sits

Everyday ingredients turn out to be full of quiet chemistry and long history. This collection gathers short, plain explanations of how bread rises, why onions sting, where common spices originate, and how coffee, tea, and chocolate reached the modern kitchen. The full list sits on the Food and Drink page, where every entry is listed in order.