1 tablespoon mayonnaise 1/2 teaspoon brown mustard (French’s “Hearty Deli” is good) 1 sesame seed hamburger bun 1/4 pound ground beef 1 slice American cheese 1-2 tomato slices 1-2 lettuce leaves, chopped 1/2 tablespoon ketchup 2 tablespoons chopped onion In Read More …