Ahi Tuna Burgers with Grilled Pineapple

For the ahi tuna patties mix 2 pounds ahi tuna steaks diced, 3 tbsp soy sauce, 1/4 cup light mayonnaise, 1 tbsp Sriracha chili sauce, 1 lg egg,1 cup chopped scallions, greens and whites, 1 tbsp fresh grated ginger, 2 tbsp sesame seeds, 3/4 cup panko bread crumbs in a large bowl. Divide into 6 equal portions and press into patties. Preheat the griddle (or a skillet) to medium heat. Once it's very hot, brush the surface with sesame oil and place the patties on the hot surface. Sear the patties for 3 minutes per side, so the interior ahi chunks are still a little pink. Flip carefully. These patties are fragile. Then immediately grill or sear 6 slices fresh pineapple, round slices for 1-2 minutes per side. For the hoisin mustard whisk together a 1/4 cup Dijon mustard, 1/4 cup hoisin sauce, 1 tbsp honey or sugar. Spread the mustard on the buns and stack the ahi tuna burgers with butter lettuce, grilled pineapple, and fresh avocado slices. Serve warm!