Soak the beans in water overnight. Place them in a saucepan of water, heat on low flame for 45 minutes and then drain. Peel and dice the vegetables, and cut the garlic into thin slices.
Heat the oil in a saucepan, add the onion and garlic and brown for 2 minutes. Then add the carrot and brown for 2 minutes, then add the celery and potato and brown them for 2 minutes as well. Finally add the beans, the grated tomato, water, salt and sugar and cook on a very low heat for 1 hour. Serve when cool.
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