1. Soak the beans overnight in the refrigerator in enough cold water to cover by 10 cm. Drain them well.
2. Combine the beans, ham hocks, onion, salt, pepper, sugar, and garlic in a large saucepot. Cover with water and bring to a boil. Reduce the heat to simmering and cook, covered, until the bean are tender, about 45 minutes. Check the seasoning and serve the beans hot.