In a medium bowl, toss together tuna, mushrooms, celery, onion, and cheese.
Add mayonnaise, lemon juice, salt and pepper.
Serve in lettuce leaves as a lettuce wrap, tear lettuce into pieces and serve with tuna mixture on top as a salad, roll lettuce and tuna mixture together in a whole wheat tortilla for a wrap, or stuff lettuce and tuna mixture in a pita.
Note: for folks who normally shy away from the fungus in your food, this is a good one to try.
There are 239 calories in 1 serving of Tuna and Mushroom Salad.