Heat the oil in a large saucepan or wok over a medium heat. Add the cumin seeds and, as they begin to sizzle, add the garlic, ginger, Coriander, turmeric and chillies.
Fry for a minute, then add the potato for few minutes until crispy on the outside.
Add the onion and continue to fry for 7–8 minutes, stirring well.
Add the spinach, put a lid on the pan and cook over a medium heat for 5 minutes. Season with salt. As the spinach begins to release its moisture, turn the heat to low and cook for a further 5 minutes.
Add the coconut milk & season to taste. Serve with chapatis or rice