Peel and crush the garlic clove with the blade of a big knife.
Heat olive oil in a frying pan, medium heat. Add the garlic clove and the sage leaves.
Meanwhile, drain and rinse the cannellini beans.
Once the garlic has browned, remove it and add the beans. Season them with a pinch of salt and 2-3 pinches of pepper and mix well.
Let simmer over low heat for about 15 minutes. Add water if necessary.