Alternatively, remove the hard outer leaves, then finely chop the soft inner core or pound it to a paste. Lemongrass stalks also make fragrant kebab skewers and basting brushes.
Put the chopped coriander, spring onions, chillies, ginger, shallot, lemongrass paste, ground coriander and a pinch of salt into a pestle and mortar and bash to a thick paste. Stir in the olive oil.