I never realised so many people do not know how to roast a bulb of garlic. No, you need not purchase one of those silly terra cotta roasters-you need only some aluminum foil and a bit of olive oil.
Here's the deal:
Slice the top off of an unpeeled bulb of garlic, exposing the tops of the cloves (you may need to cut the side ones individually. Drizzle on a bit of olive oil. Enclose it in foil tightly and place on the middle rack of a 400 degree F oven for about 20 minutes or until soft.
Wasn't that easy?