In a large skillet, cook beef, onion & green pepper over medium heat until meat is no longer pink; drain. Add the Worcestershire sauce, soy sauce, garlic powder, cumin & Italian seasoning; mix well. Simmer, uncovered, for 5-10 minutes.
Sauce
In a small saucepan, bring all the sauce ingredients to a boil. Reduce heat; simmer uncovered for 5-10 minutes. Spoon meat mixture into pita halves; top with sauce, tomatoes & lettuce.