Uova in fili (Egg Canapes)

Ingredients: Eggs, butter, mushrooms, onions, flour, white wine, fish or meat stock, salt, pepper, croutons of bread.

Put into a saucepan two ounces of butter, three large fresh mushrooms cut into slices, and an onion cut up, fry them slightly, and when the onion begins to colour add a spoonful of flour, a quarter of a glass of Chablis, salt and pepper, and occasionally add a spoonful of either fish or meat stock. Let this simmer for half an hour, so as to reduce it to a thick sauce. Then boil as many eggs as you want hard; take out the yolks, but keep them whole. Cut up the whites into slices, and add them to the above sauce, pour the sauce into a dish, and on the top of it place the whole yolks of egg, each on a crouton of bread.