1. Thread onions onto metal skewers; place on baking sheet and brush each side with oil. Season each side generously with salt and pepper.

2. Preheat grill with lid down and all burners set to high until very hot, about 15 minutes. Scrape grate clean with grill brush. Lower heat to medium and place onions on grill.

3. Grill onions, covered, until onion rounds are deep golden brown and just tender, 15 to 20 minutes, checking onions every 5 minutes and flipping and rotating skewers as needed to ensure even cooking, (keep lid down except when checking onions). Transfer onions to platter and remove skewers; discard any outer charred rings. Serve hot, warm, or at room temperature.

Serves 4