Remove any loose outer skins from garlic heads. Slice ¼ to 1.3 inch off the top of the garlic head to expose the cloves inside.
Drizzle the tops of the bulbs with olive oil and sprinkle with kosher salt. Wrap in the foil or parchment paper secured with kitchen twine.
Roast until the garlic cloves are lightly browned and tender, about 40 minutes. Begin checking the garlic at 30 minutes, the time to finish varies based on the size, age and variety of garlic used.
Let the garlic cool slightly, and then serve. Press on the bottom of a clove to push it out of its paper. Roasted garlic can also be refrigerated for up to 2 weeks or frozen for up to 3 months.
Notes
*Garlic can be roasted without foil or parchment in a clay garlic roaster or by using a small ovenproof saucepan and lid.