I'm a bit of a traditionalist with tomatoes usually, but for a
special summer gathering, I will take a thin french loaf, slice and grill it into little toasts, put a slice of Roma tomato, Basil leaf (purple if you have it) a thin slice of melting cheese (mozzarella is my fav), pop into the toaster oven or broiler
util browned, then top with some flaked tuna in a wasabi dressing with capers and fine dices of onion and celery.