Washed beans pour cold water (may be pre-soaked) and boil with chopped carrots, celery, pepper and some onion. Water should not be much if you make up. Add a small part of the oil, to boil faster beans. Add salt when beans are tender and water is fouled. Continues to melt, and during this time makes roux: in preheated oil fry the remaining onion, red pepper and tomato paste. The mixture is poured over the cooked beans, stir and simmer for 5 minutes on low heat. Remove and sprinkle with mint.