Preheat the broiler to high and set a rack about
Cut the onions into rounds ¼ inch (6 mm) thick and arrange them in a single layer on a baking sheet. Brush on both sides with oil and sprinkle with salt and pepper. Broil until blackened in spots and tender, about 10 minutes, then turn with a spatula and cook on the other side for a few minutes. Serve hot.
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