Put one ounce of butter in a frying-pan on the hot stove, let heat well, but not brown; break gently into a dish twelve very fresh eggs, slide them carefully into the pan, then season with a pinch of salt and half a pinch of white pepper; let cook slowly for three minutes. Have ready a hot, flat dish, slide the eggs gently onto it, without turning them over, and be careful to avoid breaking them; lay the dish containing the eggs in a warm place. Put two ounces of butter in the same pan, place it on the hot stove, and let the butter get a good brown color for three minutes, then drop in two teaspoonfuls of vinegar. Pour this over the eggs, and serve.