Tuna

tuna polpettine/tuna meatballs.

http://www.waitrose.com/home/recipes/recipe_directory/t/tuna_polpettine_with_cherry_tomato_and_basil_sauce.html

Tuna with avocado

My mom makes tuna pea salad:

macaroni shells (or any other noodle works too...I use egge noodles usually. If trying to go healthier U can use whole wheat or veggie noodles)
tuna
canned peas (I usually get the no salt sweet peas in cans...lower sodium and taste just as good)
mayonnaise (I've heard U can also use greek yogurt or sour cream...never tried that version though)
season to taste.

The amounts will vary based off how much you're making. For 2 boxes of noodles it's usually about 1 can of tuna, 1 can of peas, and around 1-2 tablespoons of mayonnaise. U don't want much mayo, just enough to make the noodles a little moist and coat everything.

Anyways, hope this gives U another idea