In a glass baking pan, stir together the Worcestershire sauce, garlic, 2 tablespoons red pepper flakes, vinegar, oregano, basil, black pepper and olive oil.
Place the meat into the sauce; cover and marinate overnight in the refrigerator.
Preheat an outdoor grill for medium-high heat.
Remove meat from the marinade, and discard marinade. Thread the marinated beef, chili peppers, and red bell pepper onto skewers.
Grill the skewers about 4 to 6 minutes on each side, or until the meat is of the desired doneness.
Place a large saucepan or Dutch oven over medium heat.
Remove meat and peppers from skewers, and place them in the pan. Season with chili powder, and stir in tomatoes and pinto beans.