Roast Garlic & Red Onions 12 small garlic bulbs 2 med.red onions olive oil, to taste salt and pepper, to taste Slice garlic bulbs in half horizontally; Slice onions in quarters vertically; brush cut surface with olive oil. Place cut side down in skillet; fry lightly. Season with salt and pepper; wrap in aluminum foil. Bake at 350 degrees F until soft, about 30 minutes.