Clean, washed beans soak in cold water 5-6 hours. Put it to boil for 10 minutes and drain the water. Again washed beans, pour cold water and boil until almost. In a separate bowl pour the oil and gently fry the chopped carrots, celery and peppers for about 5 minutes. Pour the water in which the beans are boiling, add the purposes heads onion, salt, pepper and mint. When the onion is tender add the beans and boil until ready. Finally sprinkle with chopped parsley.