Turn the garlic on its side and slice off about ¼ inch of the top {the pointy part}. The tops of most of the garlic cloves should be exposed.
Put in a oven-safe baking dish and drizzle a teaspoon of oil over the top. Cover tightly with foil and bake in preheated oven for 40-50 minutes, until a fork inserted into one of the cloves goes through very easily.
Let cool before using. Gently squeeze the bottom of the cloves for the garlic to come out.
Notes
*I like to roast multiple heads of garlic at once. For each head of garlic, use 1 teaspoon of oil. Put all the garlic side-by-side in the baking dish and cover with foil. Bake as directed. *1 small/medium head of garlic yields one tablespoon*