Directions:

Season tuna with salt and pepper.  Coat saute pan with cooking spray.  Saute fish 3 to 4 minutes each side, or until cooked through. 

In a large bowl, flake fish with a fork.  Add the rest of the ingredients, through salt and pepper.

Prepare grilled cheese sandwiches with bread and cheese.  When done, open sandwich and add in tuna salad mixture.