Bring the milk to a boil. Mix the sour milk (простокваша) with a cup of hot milk and slowly pour it into the pot with the remaining milk. Bring it back to a boil, stirring gently. Remove from heat and add 2-3 tablespoons of cold water. Once it cools down, strain it through cheesecloth. From two liters of milk and a cup of sour milk, you’ll get about 400-450 grams of cheese.
2 liters of milk, 1/4 liter of sour milk.