Mix juices, garlic, onion, tequila, tobasco adn pepper in a bowl. Add meat and marinate both sides. Cover and refrigerate,
turning meat over occasionally. Let sit for 4 hours or more.
To Freeze: Freeze steak in marinade in freezer bags.
To Reheat: Defrost and cook meat over grill to desired doneness, brushing with extra marinade occasionally. Place a few drops of water on each tortilla, stack,
and wrap in foil. Place on grill until heated. Cut steak into thin slices and serve on tortillas with salsa and guacamole.