5-8 fat, short green chillies, slit through the middle, seeds removed, but otherwise left intact
2 handfuls fresh coriander, leaves and stalks, chopped
3 large garlic cloves
1 tbsp peeled and roughly chopped fresh ginger
1 medium onion, chopped
2 medium tomatoes, chopped
2-3 tsp fresh tamarind paste
1 tsp cumin seeds
1 tsp ground fennel seeds
1 tsp garam masala
¾ tsp nigella seeds
1 tbsp white poppy seeds (optional)
salt, to taste
1 tsp ground turmeric
3 tbsp vegetable oil
800g/1lb 12oz lamb shoulder, cut into small cubes