Aunt Susan’s Salad Dressing
Beat together one level teaspoonful of mustard, one heaping teaspoonful of sugar, one dessertspoonful of melted butter, one half teaspoonful of salt and the yolk of one egg; add one cupful of milk and cook in double boiler until it thickens; stirring all the while. When thick add lemon juice or vinegar to taste. This dressing can be kept any length of time by bottling, not necessary to seal.