Preparing the dough: In a bowl, mix a little milk, yeast, 1 tsp. sugar, a pinch of salt, 3 tbsp. l flour. Knead a not thick dough, cover with foil and let it come up for about 20 minutes. You can put the dough on a bowl of hot water, so the dough will fit faster. Beat the eggs with the remaining sugar and salt with a mixer. Combine dough and beaten eggs. Add flour and knead thick dough, without lumps. Add a little milk and dilute the thick dough to a homogeneous liquid mass. Knead the dough in several stages, alternating flour and milk. First, knead a thick dough and dilute it with milk all the time. (So there will be no lumps in the dough.) As all the flour goes into the dough, we dilute the mass with milk, until the consistency of liquid sour cream. We cover with a film, put the dough in a bowl of hot water, so the dough will fit faster. After a while, the dough will do, you need to mix it three times. The dough came up a third time, we mix it and bake pancakes in a pan on both sides. Pancakes can be greased with butter.