Fry cabbage on 50 grams of butter, stew for another 10 minutes, at the end add salt and add nutmeg. While the filling is being prepared, beat the eggs with kefir, add soda and salt.
Then gently add the flour and stir the dough until smooth.
Lubricate the mold with the remnants of butter, pour half the dough on the bottom, put the stuffing on top and pour on the residual dough.
Bake the cake in an oven preheated to 180 degrees for about half an hour until golden brown. Serve with sour cream tea.