Salt and pepper ribs and sauté in oil. Drain excess fat and turn ribs frequently. Add black bean mixture when ribs are lightly browned. Mix well. Add stock, stir and cover. Reduce heat when mixture begins to boil and cook 25-30 minutes. Dissolve cornstarch in water to thicken. Add soy sauce, sugar, scallions, water chestnut and cornstarch to ribs and mix well.
Continue cooking 1-2 minutes.
Just before serving, add sesame seed oil and mix. Top with seeds.