We parboiled the potatoes so they'd be done at the same time as the lamb cubes.
How to Make It
Step 1
Prepare grill.
Step 2
Place potatoes in a large saucepan, and cover with water; bring to a boil. Reduce heat; simmer 12 minutes or until tender. Drain and set aside.
Step 3
Combine cumin and next 8 ingredients (cumin through garlic); add lamb, tossing to coat. Cover and refrigerate 20 minutes.
Step 4
Thread 4 lamb pieces, 2 potato halves, and 2 onion pieces alternately onto each of 12 (12-inch) skewers. Place kebabs on a grill rack coated with cooking spray; grill 4 minutes on each side or until lamb reaches desired degree of doneness.