Technique
Preheat the oven to 400 degrees F.
Cut off the top of the garlic to see the bulbs, drizzle with oil and cover the whole bulb in foil. This might take a little longer in the oven to roast so start it earlier. The goal is to have it be soft and browned. When you squeeze the garlic it will slide out of its little jackets in the bulb. Approx. 45. min.
Peel the onion and cut into chunks, then cut the red pepper into the same size chunks. Toss in a bowl with oil, salt and pepper, approx. 1-2 Tablespoons of oil. You want them coated. Place on a sheet tray with the garlic. Salt and Pepper everything. You will be layering the flavor by adding salt and pepper now.