Milbenkäse is a unique German cheese produced in Würchwitz. The cheese is made by combining mites with balls of quark (dried and seasoned with salt and caraway) in a wooden box with rye flour, then leaving the cheese for at least 3 months.
The mites' digestive juices diffuse into the cheese and cause fermentation. The rye flour is added because the mites would otherwise eat the whole cheese instead of just feasting on the crust. After just 1 month, the rind becomes yellow, and after 3 months it's reddish-brown.