Buffalo Mozzarella is a highly perishable cheese. It should be plump and tight, although rich and fatty, and while the buffalo milk is grassier tasting and ever so slightly muskier than cow milk, it shouldn't be harsh or acidic. Authentic Mozzarella di Bufala is made in several regions of southern Italy. It can be used in place of cow milk mozzarella but its flavor is so delicate and delicious it's best enjoyed fresh, perhaps with olive oil or sliced tomato rather than melted in lasagna.