Heat the oil in a pan until hot.
Add the cinnamon stick, cardamom pods and bay leaf and fry for 10 seconds or so.
Add the fresh chilli peppers and fry for a moment and then add the garlic and ginger paste and continue to fry.
Add the passata, salt and cayenne pepper and continue to fry for a minute or so.
Add the base sauce, chickpeas and precooked potato and bring up to a simmer and then cook for 5 minutes on high.
Add the ground cumin and coriander and continue for a further 5 minutes or so until the oil begins to separate at the edges of the pan and the sauce looks thick.
Add the fresh coriander, stir, and then serve.