Serves 4
Preheat oven to 350°F (175°C).
Divide the head of garlic into cloves, leaving them unpeeled. Wrap the cloves in foil and bake for 1 hour.
Sauté the onions in a little bit of oil. Squeeze the garlic out of the peels and add them to the onions. Place the onions and garlic into a pot with the rest of the ingredients. Bring to a boil, then lower the heat.
Simmer for 30 minutes and blend.