In small bowl, mix beef strips, garlic powder and 1 tablespoon of the teriyaki baste and glaze.
Heat 10-inch nonstick skillet over medium-high heat. Add beef mixture; cook 4 to 6 minutes, stirring frequently, until beef is browned and desired doneness. Stir in remaining baste and glaze; cook until thoroughly heated.
Fill each pita bread half evenly with tomato slices, lettuce and beef mixture. Wrap 2 sandwiches together securely with foil; take with you for an on-the-go dinner.