You’ll Need:Yield: 4 servings 1 1/2 pounds ground beef 1 large sweet onion, 1/2-inch slices 4 (1 ounce) slices Swiss cheese 4 crusty white or whole wheat rolls, split Lettuce Brew Sauce 1/4 cup Heinz 57 sauce 1/4 cup beerDirections : In 1-cup glass measure, combine sauce ingredients. Microwave on