Drain beans and transfer to a 4-qt.
saucepan along with 6 cups water, 4 cloves garlic, and the herb bundle.
Insert the cloves into the onion and add to the pot. Bring to a boil, reduce
heat to low, cover, and simmer until beans are tender, about 1 hour.
Remove pot from heat and season with salt and pepper
Discard herbs and strain beans, reserving cooking liquid
Transfer 2 cups beans, 1⁄4 cup cooking liquid, oil, crème fraîche, and remaining
garlic clove to a blender and purée.
Stir puréed bean mixture and about 1 cup of the cooking liquid back into pot and
cover to keep warm until served.