1Tear one hamburger bun into pieces. Place in food processor or blender container. Cover; pulse on and off, to form fine crumbs.
2Combine ground beef, 1/2 cup bread crumbs, onion, egg white, garlic, salt and pepper in medium bowl, mixing lightly but thoroughly. Lightly shape into eight 1/2- inch thick mini patties.
3Place patties on grid over medium, ash-covered coals. Grill, covered, 8 to 9 minutes (over medium heat on preheated gas grill, 9 to 10 minutes) until instant-read thermometer inserted horizontally into center registers 160 degrees F, turning occasionally. About 1 to1/2 minutes before burgers are done, place rolls, cut sides down, on grid. Grill until lightly toasted.
Serve burgers in buns with any of the topping variations, as desired.
Combine mango, pineapple, tomato, jalapeno pepper, mint, lime juice and salt in small bowl. Refrigerate until ready to use.
Makes 1 cup
5Spicy Caramelized Onions:
Heat olive oil in large nonstick skillet over medium heat until hot. Add yellow onion and red or green jalapeno peppers or sweet red bell peppers. Cook 5 minutes, stirring occasionally. Reduce heat to medium-low; stir in 1/2 teaspoon cumin. Cook 15 to 18 minutes or until onions are very tender and golden brown, stirring frequently. Season with salt, as desired.
Makes 1 1/2 cups
6Creamy Yogurt-Feta Sauce:
Combine Greek yogurt, feta cheese, onion and oregano in small bowl. Season with salt and pepper, as desired. Refrigerate until ready to use.
Makes about 3/4 cup
7Tip: To broil burgers, preheat broiler. Place burgers on rack in broiler pan so surface of beef is 2 to 3 inches from heat element. Broil 9 to 10 minutes to medium (160°F ) doneness, turning the burgers once. Place buns, cut sides up, on broiler pan so surface is 2 to 3 inches from heat element. Broil 45 to 60 seconds or until lightly toasted.