Soak the beans overnight in a saucepan of cold water. The next day, drain them, rinse well and return to the pan. Cover with water, bring to the boil and simmer for 1 hour. Skim off any froth that rises to the top during cooking. Drain and set aside.
Then make the pistou. You can make it by hand in a pestle and mortar, or use a small blender. Combine the garlic and basil leaves u