Succulent chicken tikka wraps

INGREDIENTS

• 150ml/5fl oz Greek-style yoghurt
• 1 tbsp vegetable oil
• 2.5cm/1in piece fresh ginger
• 1 garlic
• ¼-½ tsp red chilli powder
• 1 tsp garam masala
• Generous pinch green and black cardamom seeds and fennel seeds
• ¾-1 tsp salt
• 30g/1oz cheddar
• 1½ tbsp lemon juice
• 1 free-range egg
• 2 rounded tbsp gram flour
• 400g/14oz chicken breasts
• , for brushing oil
• 2 tbsp melted butter
• ¾ tsp chaat masala (optional), available from Asian stores and some supermarkets
• 5 ready-made flour tortillas
• ½ onion
• 2 tomatoes
• 1 Little Gem lettuce
• 150ml/5fl oz chutney