Gujarati cabbage with coconut & potato

Name: Gujarati cabbage with coconut & potato
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: Indian
Ingredients: 500g Charlotte or other new potato , unpeeled and halved; 2 tbsp sunflower oil; 1 pinch asafoetida (available from Bart or steenbergs.co.uk, see tip); 1 tsp black mustard seeds; 1 tsp cumin seeds; 2 dried red chillies; 1 fresh red or green chilli , deseeded and thinly sliced; 1 pointed (sweetheart) cabbage , finely shredded; juice ½ lemon; 2 tbsp desiccated or shaved fresh coconut , toasted; bunch of coriander , roughly chopped