In a small bowl, add granulated garlic, chili powder and pepper. Mix together. Rub the spice mix on both sides of the meat.
Squeeze lime juice on both sides of the meat. Marinate the meat in the refrigerator for 30 minutes.
Preheat the barbecue grill on medium heat. Remove the meat from the refrigerator about the time when starting to preheat the grill.
On a preheated grill, add the meat. Cook no more than 3 minutes per side. If cooked past medium rare the meat may be tough. The flap meat can also be cooked in a large skillet if preferred.
Transfer the meat onto a plate and let it rest (5 to 10 minutes) before cutting. Letting the meat rest is helpful for sealing in the juices so that the meat is juicier and tastes flavorful.
The shrimp can be made while the meat is resting.