BOILED SALAD DRESSING (Useful Dressing)
Dissolve 1 level tablespoon butter in a saucepan over fire. Remove from fire, blend in smoothly 1 tablespoon flour; add small cup milk, return to fire, stir all the time until it boils. Add a level teaspoon salt, 1 teaspoon sugar, a pinch of cayenne pepper, 1 teaspoon mixed mustard, the yolk of an egg. Place again over fire just to cook egg, stir with a wooden spoon, add slowly 2 tablespoons vinegar.