Sweet Potato-Pecan Burgers with Caramelized Onions

1. To prepare onions, heat 1 teaspoon oil in a large nonstick skillet over medium-high heat. Add sliced onion to pan; sauté 12 minutes or until browned, stirring occasionally. Stir in vinegar, sugar, and 1⁄8 teaspoon salt; cook 30 seconds or until vinegar is absorbed. Remove onion mixture from pan; keep warm. Wipe pan dry with a paper towel.
2. To prepare burgers, place potato in a large saucepan; cover with water. Bring to a boil. Reduce heat, and simmer 15 minutes or until tender; drain.
3. Heat large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add chopped onion and garlic to pan; sauté 5 minutes or until tender.
4. Place potato, chopped onion mixture, oats, cumin, 3⁄4 teaspoon salt, and pepper in a food processor; process until smooth. Place potato mixture in a bowl; stir in nuts. Divide potato mixture into 6 equal  portions, shaping each portion into a 1⁄2-inch thick patty.
5. Heat a grill pan over medium-high heat. Coat pan with cooking spray. Add patties to pan; cook 4 minutes or until browned. Carefully turn patties over; cook 3 minutes or until browned. Place 1 lettuce leaf on bottom half of each bun; top each with 1 patty, 1 tablespoon chili sauce, about 3 tablespoons onion mixture, and top halves of buns.

Recipes reprinted with permission from Cooking Light Way to Cook Grilling: The Complete Visual Guide to Healthy Grilling by Cooking Light (Oxmoor House).