Heat your slow cooker if you need to. Fry the beef in batches in 2 tbsp oil until it is browned all over and tip into the slow cooker. Put the remaining oil in the frying pan and fry the onion over a low heat until it starts to soften. Add the garlic and ginger and fry for 1 minute.
Add all the spices and fry for 1 minute or until the spices start to smell fragrant. Add the coconut milk and bring to a simmer, then tip everything into the slow cooker.
Cook for 4 hours on high or 8 hours on low. Stir in the coriander and serve.
