I love a tuna melt. I make this mediterranean influenced tuna salad.
Tuna, chopped red onion, chopped celery leaves, chopped kalamata olives, lemon zest, lemon juice and a little mayo.
I put some of the tuna salad on one side of the pita and topped it with feta and put it under the broiler just until the feta started to melt. I put some chopped spinach and quartered cherry tomatoes on the the other side and drizzled that with a lemon vinaigrette. Fold and enjoy!