This recipe was found on The German Corner website. This is an easy overnight instruction on how to make quark. Quark is a German dairy product similar to sour cream. It is used to make German Cheesecakes and other desserts and dishes. It is even delicious with some fresh herbs and spread on some bagels or fresh crusty bread rolls! You will need a covered pyrex baking dish or similar along with a large colander and a cheesecloth or plain linen.