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Mayonnaise Sauce

Mix in a two-quart bowl one even tea-spoon ground mustard, one of salt, and one and a half of vinegar; beat in the yolk of a raw egg, then add very gradually half a pint pure olive-oil (or melted butter), beating briskly all the time. The mixture will become a very thick batter. Flavor with vinegar or fresh lemon-juice. Closely covered it will keep for weeks in a cold place, and is delicious.