Drain the chickpeas and collect the liquid. Fry the onions, garlic, chili peppers and turmeric with ghee or clarified butter until golden. Add the tomatoes and cook until soft.
Then add the coriander powder and the chickpeas and cook for 10 minutes. Pour in 250 ml of the collected chickpea liquid and cook for another 10 minutes.
Add the garam masala and lemon juice and stir in the fresh coriander. Simmer for 2 - 3 minutes - if necessary, add more chickpea liquid until the required sauce consistency is achieved.