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Brown ground beef in large skillet and drain. Add Worcestershire sauce, ketchup, dried onion, and salt and pepper to the beef and simmer for 5 minutes.
Sprinkle shredded cheese down center of each tortilla. Add a few heaping tablespoons of the beef mixture on top of the cheese.
Spread some mustard on top of the beef along with some slices of tomato. Roll up tortilla burrito-style and place wraps on preheated indoor grill (I used my George Foreman).
Grill wraps for about 5 minutes until cheese is melted. Cut on a diagonal and serve immediately!