Cup of Yum
1. Place Flank Steak in a large Ziplock bag. In a small bowl, combine oil, minced garlic, salt, and pepper. Add the mixture to the steak and let it marinate for 1-6 hours.
2. Remove the steak from the bag. Lightly wipe with a towel to get rid of excess marinade. Place the Flank Steak on a preheated grill to medium heat. 
3. Grill steak for about 8 minutes on each side or until internal temperature reaches 160F. Set aside and let the beef rest for at least 5 minutes. Slice beef into thin strips.
4. Cut lettuce leaves into strips. Thinly slice tomatoes, avocado, and onion.

Serving

Cup of Yum
1. Option 1: Serve the filling options on a tray to let everyone build their own wraps.
2. Option 2: Prepare each wrap by placing it down flat and top it with beef and lettuce leaves. Add avocado, onion and tomato. Wrap it up and serve!