ful vinegar, one yolk of egg, salt and pepper, broth or water in sufficient quantity.
Put first on the fire the flour with half the butter and when it begins to be browned pour over it the broth or the water little by little, stirring with the wooden spoon and adding the rest of the butter and the vinegar without making the water boil too much. When taken off the fire add the yolk of the egg, stir and serve.
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YELLOW SAUCE
(Salsa gialla)
This sauce is especially good for boiled fish, and the quantities indicated below are sufficient for a piece of fish or a whole fish weighing about a pound.
Put on the fire in a little saucepan one teaspoonful of flour and two ounces of butter, and when the flour begins to be browned, pour over it little by little one cup of the broth of the fish, that is to say of the water in which the fish has been boiled. When you see that the flour does not rise in the boiling water, take away the sauce from the flour and pour over two tablespoonfuls of olive oil and the yolk of an egg, stirring and mixing everything well. Squeeze in the sauce half a lemon and season generously with salt and pepper. Let it cool and then pour over the fish
that is to be served with a sprig of parsley.
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