1 small green chilli
1 tbsp chopped coriander leaves
25g/1oz fresh coriander, including stalks
1 small garlic clove
1 tbsp lemon juice
10 fresh mint leaves
450g/1lb baking potatoes
½ small red onion, sliced into narrow rings and separated
1 tomato, finely sliced into rounds
10 cashew nuts, soaked in hot water for 30 minutes
1 tsp ground cumin
2 tbsp sev (fried gram flour noodles – see tip)
1 tbsp vegetable oil
¼ tsp salt
1 tsp sugar
¼ tsp ground turmeric
2 tbsp butter, softened, plus 1 tbsp to fry
4 slices medium-strength cheddar
4 slices mozzarella (optional, or use all cheddar)
4 slices shop-bought garlic ciabatta (about 20cm/8in long)