Fry 2 tbsp flour 1 tbsp butter, diluted with 500 ml milk, add salt to taste and tampering with pepper. We remove the sauce from the heat, leave to cool down and add 6 egg yolks, well beaten in advance, 200 g finely chopped ham, 150 g grated cheese and finally egg whites broken by thick snow. Pour into greased with butter glass container, sprinkle top with grated cheese and bake in moderate oven.