Add the raw beef stir fry strips, sliced onion, sliced red and yellow peppers, salsa, lime juice, and Worcestershire sauce to a large resealable freezer bag. Remove the excess air, seal and freeze.
Cooking Instructions:
Thaw. Stir fry in skillet over high heat on stovetop until meat is cooked through. This really doesn't take long at all especially if the beef strips are thin.
Serve in flour tortillas. If you want, you can top the fajitas with sour cream, salsa, shredded cheese, cilantro, or guacamole.