Pour 1/2 cup Worcestershire over steak in deep dish. Marinate 30 min. Rub meat with seasoning mix.
GRILL meat and vegetables 10 to 15 min. until meat is medium rare and vegetables are charred, but tender. Thinly slice meat and vegetables.
Place vegetables in large bowl. Stir in chili sauce and remaining 1/4 cup Worcestershire. Layer meat and vegetable mixture on tortillas, dividing evenly. If desired, serve with sour cream and cheese.