Slice two large, sound onions, and fry them in two ounces of butter, in a saucepan, stirring frequently, so that they do not burn; when done, dredge in a good pinch of flour, moistening with half a pint of cream or milk, and season with a pinch of salt, half a pinch of pepper, and a saltspoonful of nutmeg. Break six eggs, froth the whites, mix the yolks with the onions, and afterward the beaten whites, stirring well. Lay two pieces of white paper on the bottom of a baking-tin, butter them thoroughly, lay the eggs on top, and set it in the oven for about fifteen minutes. When done, turn them on to a hot dish, remove the papers, add two tablespoonfuls of Espagnole sauce (No. 151) to the eggs, and serve.