Roughly chop the dip ingredients and put the chilli, garlic, lemon grass & ginger in a mini food processor. Blend into a textured paste then add the remaining ingredients. Toss well.
In a separate bowl mix the washed prawns with 100 ml of the dip. Marinate for 15-20 minutes.
Pour the remaining sauce into a serving dish. Set aside.
Heat the oil in a grill/griddle pan. Remove the prawns from the marinade then fry on both side for about 2 minutes, until they turn pink.
In the meantime: finely slice the spring onions and chop the herbs & chilli.
Tip the cooked prawns in to a serving bowl, add the spring onion, coriander, chillii and mint.
Serve with dip.