Grease the inside of your slow cooker.
Toss the beef in the cornflour to coat.
Arrange the sliced onion and potatoes in the base of the slow cooker.
Place the beef, lime leaves, star anise and peanuts on the onion and potatoes.
In a jug, whisk together the curry paste, stock, coconut milk, fish sauce, tamarind paste and brown sugar.
Pour the jug contents over the curry ingredients already in the slow cooker.
Cover and cook for at least 8 hours on Low or 5 hours on High.
Serve with boiled rice, fresh coriander and a sprinkling of chopped peanuts.