Cheese begins with milk, as most people know. But vinegar is a key ingredient that really gets the process going. Vinegar is what encourages the milk to curdle and give cheese an acidic flavor. Before vinegar, bacteria was used to produce the acid. Using bacteria is a lengthier process and the cheese continues to increase in flavor as it ages. Some of the most expensive cheeses are still made with acid-producing bacteria instead of vinegar.
Many cheeses can be made with vinegar, including the simplest of all, cottage cheese. Cottage cheese does not require rennet, which is an enzyme that helps to harden the cheese curds. This enzyme is derived from calf stomachs, as they have natural enzymes for processing cow milk. But rennet, as well as acid-producing bacteria, is temperature sensitive and requires several steps in processing.
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