Whole vs. 2% vs. Non-Fat Milk: While whole milk is our favorite for making ricotta, 2% milk can also be used, though the ricotta is slightly less rich and creamy. Avoid using skim and nonfat milks; these don't separate as easily into curds and whey.
Pasteurized Milk: Pasteurized milk is fine to use for making ricotta, but avoid UHT (Ultra High Temperature) pasteurized milk as this process changes the protein structure of the milk, preventing it from separating.
Using the Leftover Whey: The leftover whey can be used in place of water in any baking recipe, whizzed into smoothies, or drunk on its own over ice.