2 long green chillies, finely sliced
1 tsp ground coriander
6 garlic cloves, roughly chopped
7.5cm/3in piece fresh root ginger, roughly chopped
2 lemons, juice only
1 x 400g tin chopped tomatoes
250g/9oz wholemeal plain flour, plus extra for dusting
salt and freshly ground black pepper
4 cardamom pods, split
50²µ/1ΒΎ΄Η³ϊ cashews, roughly chopped
2 tsp chilli powder
Β½ tsp ground cinnamon
1 cinnamon stick
2 tsp ground cumin
1 tbsp garam masala
Β½ tsp ground turmeric
1 tbsp vegetable oil
75g/2Β½oz chilled butter, plus 25g/1oz melted butter
50ml/2fl oz double cream
150g/5Β½oz plain, full-fat yoghurt
4 large boneless skinless chicken breasts, cut into 2.5cm/1in dice