These garlicky potatoes are easily grilled in 2 foil packets.
Heat the grill to medium. In a large bowl, combine potatoes, unpeeled cloves from head of garlic, and olive oil; season with salt and pepper
Layer 2 large pieces (2 feet each) heavy-duty foil for each of 2 packets. Divide the potato mixture between foil pieces. Fold the foil over the potatoes, leaving room inside for the potatoes to roll when the packets are shaken; crimp the edges.
Place packets on grill; cover. Cook until tender, 35 to 45 minutes, shaking packets often for even cooking. Remove from grill; let cool slightly, then carefully open packets. Serve hot.