In a large bowl, combine the ground lamb with the garlic and season with salt and pepper, to taste. Divide the lamb into 12 small balls and form them into patties. Cook the patties on a hot nonstick grill pan over medium heat for about 3 to 4 minutes per side. (The meat will release from the pan when ready.)
Put the 3 lamb patties in the middle of each flatbread and top with 2 tablespoons crumbled feta and fresh mint. Enjoy!