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Blitz the onion, ginger and garlic in a food processor with 1 tbsp water until smooth.
Fry the cumin seeds in oil for a few seconds. Add the onion paste and brown over a medium heat. Add a dash of water if it starts to catch.
Sprinkle in the turmeric and chilli. Add the tomatoes and fry for 5 minutes. Stir in the potatoes and 250ml/9fl oz hot water. Cook covered for 10 minutes.
Add the chicken and garam masala. Simmer for 15-20 minutes until cooked. Season with salt. Tip into a bowl, scatter over coriander and serve with flavoured rice and natural yogurt.