Add the lemongrass, lime leaves, chilli, red curry paste, fish sauce, coconut milk, brown sugar and peanuts to the slow cooker (at least 5 litre capacity) and stir well. Add the beef and mix into the sauce.
Set the slow cooker to high, cover with the lid and cook for 4–5 hours. Remove the lid, add the pumpkin and stir to immerse it in the liquid. Cover and continue to cook for 3 ½ hours. Remove the lid, add the green beans, cover and cook for 20–30 minutes until the beef is soft and breaks up easily.
Remove the lemongrass and lime leaves and serve the curry on a bed of rice.
