Slow cooker chicken tikka masala - Good Food Middle East

Ingredients

• 8-12 boneless, skinless chicken thighs, each cut into 3 chunks
• 2 tbsp veg or rapeseed oil
• 1 large onion, chopped
• 2 garlic cloves, crushed
• thumb-sized piece ginger, finely grated or chopped
• 3 tbsp tikka curry paste
• 500ml passata
• 1 tbsp tomato purée
• 1 tbsp malt vinegar
• 1 tbsp light brown soft sugar
• 1 cinnamon stick
• 5 cardamom pods
• 100ml double cream
• handful chopped coriander
• cooked basmati rice, lime wedges and naan bread, to serve (optional)