Salad Dressing

One cup butter, 1 cup cream, sweet or sour, 5 eggs, 1 tablespoonful mustard, mixed smooth with little water, 1 teaspoonful black pepper, 1 teaspoonful salt, 1 cup vinegar, 1 tablespoon sugar, 1 tablespoon flour if desired. Stir constantly while cooking. This makes a solid quantity which can be doubled with cream.