The philosophy of a sauce, when understood, enables even an untrained cook to make a great variety of every day sauces from materials usually found in every household; to have them uniform, however, flavorings must be correctly blended, and measurements must be rigidly observed. Two level tablespoonfuls of butter or other fat, two level tablespoonfuls of flour, must be used to each half pint of liquid. If the yolks of eggs are added, omit one tablespoonful of flour or the sauce will be too thick. Tomato sauce should be flavored with onion, a little mace, and a suspicion of curry. Brown sauce may be simply seasoned with salt and pepper, flavored and colored with kitchen bouquet. Spanish sauce should also be flavored with mushrooms, or if you can afford it, a truffle, a little chopped ham, a tablespoonful of chives, shallot and garlic. Water sauce, drawn butter and simple sauce Hollandaise, when they are served with fish, must be flavored with a dash of tarragon vinegar, salt and pepper.