Three types of cheese make this tuna melt extra special. Top toasty, thick-sliced whole-grain bread with diced crispy pancetta and charred radicchio. Spread with a light and creamy mixture of chunky Ahi tuna, green onion, celery and mayo. Arrange Bongards Provolone, Cheddar, and Mozzarella natural cheese slices over the top and broil until the cheese is golden brown and bubbly. Tuna salad and melty cheese — a match made in heaven.