Season ground beef with a sweet and smoky blend of tomato, onion, garlic and black pepper for hearty burgers. Pepper jack cheese adds heat and grilled red onions add sweet caramelized flavor.
Mix ground beef and Sauce Mix-Ins until well blended. Shape into 4 patties.
Grill over medium heat 4 to 6 minutes per side or until burgers are cooked through (internal temperature of 160°F). Grill onions in grill basket or grill rack 3 to 4 minutes or until tender and lightly browned, stirring frequently. Add cheese slices to burgers 1 minute before cooking is completed. Toast rolls on the grill, open-side down, about 30 seconds or until golden.
Serve burgers on toasted rolls topped with grilled onions and lettuce.