Make your own burger sauce by using ¼ cup mayonnaise, 2 tablespoons ketchup, 1 teaspoon yellow mustard, 1 teaspoon relish, 1 teaspoon lemon juice or white vinegar, 1/8 teaspoon garlic powder, and a pinch each celery salt and pepper. Whisk all of the ingredients well, and use this mixture in place of store-bought sauce.