Roasted Garlic & Cauliflower Soup without onion

1 bulb of elephant garlic, or 2 large bulbs of American garlic, unpeeled olive oil fine sea salt and fresh ground black pepper 6 potatoes , peeled and cut in[...]

1 head cauliflower 1 large head of garlic 1/2 tablespoon olive oil 1 tablespoon butter 1 1/2 stalks celery , diced 1 yellow onion , diced 1 carrot , diced 1/2[...]