1 large red chilli, halved, deseeded and finely sliced
½tsp each black mustard seeds, cumin seeds, turmeric
250g spinach leaves
Heat the oil in a large pan, add the onion, garlic and ginger, and fry for about 3 mins. Stir in the potatoes, chilli, spices and half a tsp salt and continue cooking and stirring for 5 mins more. Add a splash of water, cover, and cook for 8-10 mins.
Check the potatoes are ready by spearing with the point of a knife, and if they are, add the spinach and let it wilt into the pan. Take off the heat and serve.