1. Clean and shell the prawns, cut them down the middle and flatten them.
2. Drizzle fish sauce over the prawns and keep in the fridge for 5 minutes to chill them.
3. Chop the chillies and 4 garlic cloves finely, and mix with the lemon juice and celery. You can see this mix in the background of the photograph, it's the mixture you spoon onto the prawns.
4. Onto a plate, serve the raw prawn, drizzled in the fish sauce, with the chilli/garlic mixture on one side, and the garnishes: the mint leaves, lemon slices, sliced garlic and chopped celery.
5. To eat, take a prawn in your hand, spoon on the mixture, add some mint, celery, sliced garlic and a squeeze of lemon. Place the whole thing in your mouth and bite off the tail. I told you it was intense!