6 green chillies, roughly chopped (seeds optional)
12 fresh curry leaves
1 x 4cm/1陆in fresh ginger, roughly chopped
2 large onions, roughly chopped
1 kg/2lb 4oz large white potatoes (such as Maris Piper), unpeeled
1 tbsp cashew nuts
1 tsp black mustard seeds
1 tsp salt
陆 tsp sugar
1 tsp ground turmeric
2 tbsp vegetable oil