Prepare the lemongrass by removing the tougher outer leaves. Top and tail the lemongrass then finely chop in the tender inner stalk. Some people like to bash the stalk with the side of a knife to soften… feel free to take your aggression out this way.
Remove and discard the cinnamon stick, star anise and kaffir lime leaves. Stir in one tablespoon of cornflour diluted in cold water and simmer for a couple of minutes on the hob if you wish to thicken the stew further.