When it comes to cheese ... Lyndhurst's mozzarella maven You have to start with a curd. "It's all about the butterfat," he said. Milk contains a protein called casein and when you add an acid ...

When it comes to cheese ... (like vinegar or lemon juice) it causes those proteins to clump together. The solid clumps are called curds, and the leftover liquid is called whey. Mozzarella curd ...