small handful fresh coriander
2 garlic cloves, crushed
1 onion, finely chopped
2 spring onions, thinly sliced
400g tin butter beans, drained
1 tsp chilli powder
pinch rock salt
1 tsp salt
3 tbsp art masala mix (see recipe here), alternatively you can use garam masala
2 tbsp vegetable oil, plus extra for greasing
1 free-range egg, beaten
2 x 320g packs ready-rolled shortcrust pastry
450g/1lb lamb mince