Step 1

Preheat oven to 375 degrees F.

Step 2

Stir together tuna, mayonnaise, mustard, and relish.

Step 3

Spread the tuna salad evenly over each tostada. Sprinkle cheese over the tops.

Step 4

Bake in preheated oven for 8 minutes, until cheese is melted and tostada edges are just starting to brown.

Step 5

Top with lettuce, then tomato, and sprinkle tops with salt and/or pepper if desired. Serve, and enjoy the fun of trying to balance your vegetables on top!