Scald, peel and core the tomatoes. Chop the pulp. Cut the sage leaves into fine strips and chop the garlic cloves.
Heat four tablespoons of olive oil in a saucepan and fry the garlic and half of the sage strips in it. Drain the beans and add them to the saucepan with the tomatoes. Salt and pepper and simmer gently for about 20 minutes.
Heat a tablespoon of olive oil in a pan and fry the remaining sage strips in it. Season the beans again with salt and pepper and sprinkle with the fried sage.