1Heat coals or gas grill for direct heat. Peel loose paperlike layers from garlic bulbs, but do not separate cloves. Place each garlic bulb on 18-inch square of heavy-duty foil. Brush with oil; sprinkle with thyme. Wrap bulbs securely in foil.
2Cover and grill garlic 4 to 6 inches from medium heat 25 to 35 minutes or until garlic cloves are very soft. Add focaccia to side of grill for last 8 to 10 minutes of grilling, turning once, until golden brown. To serve, squeeze garlic out of individual cloves onto slices of focaccia.