1Heat a gas or charcoal grill.
2In a medium bowl, combine the ground beef, taco seasoning, grated onion and Worcestershire sauce. Season with salt and pepper. Add in the crushed tortilla chips and lightly combine. Shape the mixture into 4 patties.
3Place the patties on the grill over medium heat. Close grill and cook, turning once, until desired doneness – about 10 minutes for medium. Top each patty with the cheese and cook just until the cheese melts.
4Layer the buns with sour cream, a patty, lettuce, tomato and salsa.