Quick and easy go-to sandwich for lunch! Next to a pickle and a sky-high pile of bistro chips, that plate is looking mighty fine. Just need canned tuna, mayo, mustard, parmesan, S&P, red onion, and your toasty bread of choice.
Drain the tuna and place in a medium sized bowl. With a rubber spatula or spoon, combine tuna with red onion, garlic powder, parmesan, mayo, mustard, lemon, salt and pepper.
Toast bread slices. Divide tuna over two slices equally and top with tomatoes. Cover with remaining two slices. Enjoy!
Notes
This is the best recipe if you have leftover grilled tuna steaks. Just shred them with a fork and prepare the same way. The same goes for leftover grilled chicken!