3 long red chillies (do not deseed), roughly chopped
1 tbsp ground coriander
25g/1oz fresh root ginger, peeled, roughly chopped
4 onions, 3 finely sliced and 1 chopped
500g/1lb 2oz potatoes, peeled and cut into roughly 2.5cm/1in pieces
1 tbsp English mustard powder
2 tsp cayenne pepper
1 tsp ground cinnamon
6 garlic cloves, roughly chopped
1 tbsp ground cumin
1 tbsp ground paprika
100ml/3陆fl oz red wine vinegar
2 tsp sea salt flakes
2 tbsp sunflower oil
125ml/4陆fl oz sunflower oil
2 tsp ground turmeric
1.3 kg/3lb boneless lamb shoulder, cut into roughly 4cm/1戮in chunks