Heat 3tsp of oil. Add onion pcs, fry for 2 min. add tomato pcs, turmeric, salt, red chilly powder, jeera powder-2 tsp, coriander powder, cilantro, Jalapeños and cover with lid and cook in medium low flame for 5 min. Add the black beans, mix well. Add 1 cup of water and cook covered for 5 min. The mixture should be lightly thick. The black beans curry thickens after an hour or when refrigerated