1 plump green chilli, finely chopped (seeds removed if preferred)
1 tsp ground coriander
2 tsp fresh lemon juice
½ onion, finely sliced
650g/1lb 7oz potatoes, preferably Maris Piper, peeled and cut into 2.5cm/1in chunks
pinch asafoetida
1 tsp cumin seeds
1 tsp yellow mustard seeds
1 tsp flaked sea salt
3 tbsp sunflower oil
¼ tsp ground turmeric