In a large bowl combine potatoes garlic, onion and olive oil, season with salt and pepper. Using two large pieces (about 2 feet) heavy-duty foil, divide potato mixture evenly between the two. Wrap loosely then wrap each with another piece of foil. Place packets on grill, cooking until tender about 30-45 minutes. Shake packets occasionally for even cooking. Let cool slightly before opening. Serve while hot. Serves 6-8.








