Sift the flour into a bowl. Add salt, eggs and milk and stir until a thin batter is formed. Let the dough stand briefly so that the flour can swell.
Heat the fat in a pan. Bake the pancakes and keep them hot.
Ham filling: steam 2 onions in margarine. Add the mushrooms and the diced ham to the onions. With 1 tablespoon. Dust the flour. 1 tablespoon Add tomato paste, 1/2 cup water and pepper and stir everything together. Let simmer for 2 minutes.