Preheat oven to 400 degrees F. Prepare garlic bulb for roasting by slicing off the top and rubbing a drizzle of olive oil on top until it slightly steeps through the cracks. Wrap in aluminum foil, and bake for 30-35 minutes until tender.
Open the foil to let the garlic cool before removing cloves and smashing them with a fork. In a small bowl, combine the smashed garlic, olive oil, and rosemary. Add sea salt and pepper to taste. Serve with fresh bread, or drizzle on fresh tomatoes.