4 cups whole milk
2 tablespoons plain yogurt
Boil the milk in a pot and let it cool down at room temperature until you can put your finger in few seconds. Milk should be quite warm but not too hot. Lay a towel or a cloth on your kitchen bench and place the pot on it. Mix the plain yogurt into the milk and close the lid of the pot. Cover the pot with the cloth well. Let it incubate 8-10 hours in winter and 6-8 hours during summer days. You can serve yogurt after it is refrigerated at least one day.