Gringo Burgers with Spicy Onions

1 tablespoon vegetable oil
1 large sweet onion, halved and thinly sliced . 4 tablespoons TABASCO. brand Chipotle Pepper Sauce, divided

1 tablespoon Worcestershire sauce
1 1/2 pounds lean ground beef
1/4 cup chopped cilantro
1/4 cup chopped green onion
1 teaspoon salt
4 slices Monterey Jack cheese
4 hamburger buns, toasted
Mixed baby greens

Heat oil in a large skillet over medium-high heat; add onion and cook 5 minutes or until golden brown, stirring often. Stir in 1 tablespoon TABASCO Chipotle Sauce and the Worcestershire sauce; mix well and remove from heat.

Combine ground beef, cilantro, green onion, salt and the remaining 3 tablespoons TABASCO Chipotle Sauce; mix well and shape into 4 burgers.
Grill over medium-high heat to desired doneness, about 3 minutes per side for medium-rare. Top each burger with a slice of cheese and grill just until melted. Place on buns and top with spicy onions and baby greens.

Makes 4 servings