Easy-Made German Quark
Do not use low-fat buttermilk. It will not work well.
Add some freshly cut chives, a couple cloves of minced garlic, onions, salt, and pepper for taste and you have a basic krauter(herbal) quark, a great spread right on your favorite bread or roll.
For cheesecake, let it drain a little longer.
It can be made using a yogurt maker, but this is an overnight procedure. This is a quicker way that yields pretty much the same product.