Big mac Sauce 1/2 cup mayonnaise 2 tablespoons French dressing 4 teaspoons sweet pickle relish 1 tablespoon finely minced white onion 1 teaspoon white vinegar 1 teaspoon sugar 1/8 teaspoon salt 1. Combine all of the ingredients in a small bowl. Stir well. 2. Place sauce in a covered container and refrigerate for several hours, or overnight, so that the flavors blend. Stir the sauce a couple of times as it chills. Makes about 3/4 cup.