Mix the finely chopped or grated Palm sugar with 1 tablespoon of hot water in a small container and stir till it dissolves (or as much as possible)
Add the ginger, (garlic) , zest, pepper, fish sauce, oil and coriander and stir well.
Slot the prawns onto skewers starting at the tails and working up to where the heads were. This type of skewer makes them look great and allows 1 prawn per person each skewer.
Lay the prawns in a container and pour over the marinate rubbing onto the skewers. Leave to marinate.
Cook the prawns for 1 minutes or till starting to turn opaque before turning and over till just cooked through, about 3-4 minutes
Serve with extra coriander and limes to squeeze