Separate the eggs, allowing one to each person. Beat the whites to a stiff froth. Heap them into individual dishes, make a nest, or hole, in the center. Drop into this a whole yolk. Stand the dish in a pan of water, cover, and cook in the oven about two or three minutes. Dust lightly with salt and pepper, put a tiny bit of butter in the center of each, and send at once to the table. This is one of the most sightly of all egg dishes.