Directions:
1) Place steak in a shallow glass baking dish
2) In small bowl, combine salsa, Worcestershire sauce, lime juice, oil, brown sugar and garlic
3) Mix well
4) Pour over steak
5) Cover and refrigerate at least four hours or overnight, turning occasionally
6) Remove steak from salsa mixture
7) Reserve mixture
8) Over medium-hot coals, grill steak, onions and peppers for 10 minutes for medium-rare doneness and until vegetables are tender and lightly charred, turning occasionally
9) In small saucepan, over medium-high heat, bring salsa mixture to a boil and boil two minutes, stirring frequently
10) Set aside
11) Thinly slice steak diagonally across the grain
12) Cut peppers into strips
13) To serve, place steak, peppers and onions in warm tortillas and drizzle with salsa mixture
14) Serve with beans, guacamole and cilantro, if desired