Preheat oven to 375 degrees F (190 C).
Cut stem end off garlic. Drizzle with 1 tablespoon olive oil and a pinch of salt and pepper. Roast, on a baking sheet, wrapped in foil, for 35-45 minutes or until tender. Allow to cool. When cool squeeze roasted garlic out of skin, and reserve. Reduce oven to 350 degrees F (180 C).
Cut boule into 10 slices, 1-inch thick through top of boule, stopping about 1-inch before the bottom, keeping slices attached at the bottom of the loaf.
In a small bowl, mix together roasted garlic, olive oil, rosemary and salt.
Spread evenly on slices of bread.
Wrap entire boule in tin foil. Place on a baking sheet and bake, in preheated oven for 25 minutes. Open foil, and continue to cook for 5 minutes or until golden brown.