Beef Fajitas

Name: Beef Fajitas
Prep time: 2 h
Cook time: 15 min
Total time: 2 h 15 min
Cuisine: Mexican, American, Latin American
Ingredients: 1 whole beef flank steak; 1/2 c. olive oil; 3 tbsp. Worcestershire sauce; 1/3 c. fresh-squeezed lime juice; 3 cloves garlic, minced; 1 tbsp. cumin; 1 tbsp. chili powder; 1/2 tsp. red pepper flakes; 1 tsp. salt; 1/2 tsp. black pepper; 1 tbsp. sugar; 2 medium onions, halved and sliced; 1 red bell pepper, sliced; 1 orange bell pepper, sliced; 1 green bell pepper, sliced; 1 yellow bell pepper, sliced; Oil, for frying; Flour tortillas, warmed; Cheese (grated cheddar/Jack or crumbled queso fresco), for topping; Salsa, for topping; Sour cream, for topping; Cilantro leaves, for topping