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Export 8 ingredients for grocery delivery
Preheat oven to 375 degrees F.
Stir together tuna, mayonnaise, mustard, and relish.
Spread the tuna salad evenly over each tostada. Sprinkle cheese over the tops.
Bake in preheated oven for 8 minutes, until cheese is melted and tostada edges are just starting to brown.
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!