Boil the black beans with the salt for about 1-1/2 hours or until tender.
Meanwhile, put celery, cilantro, onion through food processor. Do not grind into a mush!
Turn the mixture into a large skillet or pot and fry with the oil until onions are cooked. Add basil and pepper.
When beans are done, mix in with celery/onion/cilantro mixture and simmer for 1/2 hour. You can also put them in a dish and in the oven.
Serve with flour tortillas, vegan sour cream and salsa.