Boil 1 liter of water and let it cool down. Put the flour and garlic in an earthenware pot, add a little salt and sugar to taste and the mushrooms and pour the boiled water over them. Cover the pot with a clean tea towel and place in a cool place for 3-4 days. The finished sourdough should smell pleasantly sour and not foul.
Mix 500 ml of sourdough with 1 liter of hot water, add some fresh garlic and cream and bring to the boil. Serve with hard-boiled eggs. You can also add boiled and sliced sausage, ribs, bacon, onions or boiled potatoes.