1. Heat the oil in a large saucepan. Add lean beef braising steak, onion, chilli, cook until meat has browned.
2. Add the red Thai curry paste, brown sugar, tamarind paste, potatoes, coconut milk and pineapple juice.
3. Cover and cook in a preheated oven for 1 1/2 hours.
4. Remove from oven and add the peanut butter and aubergine. Cover and return to the oven and cook for 30 minutes or until meat is tender.
5. Sprinkle with coriander and sliced chillies.
Serve with sticky coconut rice (cook basmati rice in water and coconut milk). Make the rice a bit sticky with a coconut flavour.