The lemon wedges caramelize on the grill, making them slightly sweet. When serving the skewers, squeeze the lemon juice over the lamb for added flavor.
Heat grill to high. Assemble 4 long skewers, alternating 5 lamb cubes with 2 lemon wedges on each. Arrange skewers in a nonmetallic dish.
In a small bowl, whisk together oil, lemon juice, and garlic. Pour marinade over skewers; turn to coat. Letstand at least 5 minutes (or cover and refrigerate overnight, turning occasionally). Season with salt and pepper.
Lightly oil grates. Place skewers on grill; cover grill,and cook, turning occasionally, until grill marks are visible and meat is cooked to desired doneness, 1 to 2 minutes per side for medium-rare. Serve with sauce, and garnish with parsley sprigs, if desired.