Preheat oven to 350°F (170 C).
Remove dirt from garlic with a damp cloth, keeping wrappers intact.
Cut the top 1/4 inch off heads of garlic to expose cloves, leaving bulbs and wrappers intact.
Place garlic bulbs in baking dish. Add oil and toss to coat.
Turn garlic cut side up. Cover with aluminum foil.
Bake until garlic skins are golden brown and cloves are tender, about 60 minutes. Cool.
Holding each bulb, squeeze roasted garlic pulp from the top.