Ingredients: 600g (1 lb 5 oz) chicken thigh fillets | vegetable oil | 1 cup cornflour (cornstarch) | 2 large sprigs fresh curry leaves | 3 tsp finely chopped ginger | 2 garlic cloves, chopped | 2 long green chillies, chopped | 1 tsp Korean gochugaru chilli powder | 2 tbsp tomato ketchup | thinly sliced red onion & lemon wedges, to serve Marinade: 2 tbsp natural yoghurt | 2 tbsp fresh lemon juice | 1 tbsp garam masala | 1 tbsp sweet paprika | 1 tsp sugar | 1/2 tsp sea salt | 1/4 tsp white…