Cook the beans in plenty of salted water with the bay leaf for 2 hours. (If canned beans are used, drain and collect 100 ml)
Peel and finely dice the potatoes and cook for 30 minutes.
Drain, collecting 100 ml of the cooking water, stir with the cream, beans and potatoes. Peel and squeeze the garlic, add and roughly mash and stir. Season with salt and pepper, keep warm.