Havarti, Cucumber, and Dill Swap out American cheese for sliced Havarti. Swap out tomato, pickles, and iceberg for thinly sliced cucumber seasoned with salt, shaved red onion, and fresh dill. Serve with Dijon mustard and mayonnaise or desired condiments.
Feta, Grilled Onions, and Radicchio Swap out American cheese for 4 ounces feta cut into slices or crumbled. Swap out iceberg for thinly sliced radicchio, lightly tossed with red-wine vinegar and extra-virgin olive oil and seasoned with salt. Omit tomato and pickles. Slice a sweet onion, such as Vidalia, into 1/4-inch-thick rounds. Brush with olive oil and season with salt and pepper. Grill, turning once, until charred in places and crisp-tender, 5 to 7 minutes.
Fontina, Grilled Mushrooms, and Arugula Swap out American cheese for sliced Fontina. Swap out iceberg for arugula. Omit tomato and pickles. Halve 8 ounces cremini mushrooms (about 2 cups), brush with olive oil, and season with salt and pepper. Grill, turning a few times, until charred in places and tender, 5 to 7 minutes. Serve with whole-grain mustard or desired condiments.