Once the oil is separated, add turmeric, red chilli powder, coriander powder and chana masala. Cook the tomato-onion mixture for another two minutes, and then add cooked chole with little water. Stir well to mix the masala with the chole or the chickpeas. Check salt and allow it to cook for a few minutes. The chola is done! You can garnish with chopped onion and coriander leaves.