This is lovely without the prawns.
Whisk the rice vinegar, sesame oil, sugar, ginger, lime juice and salt to make a dressing - it should be a balance between sweet and sour. Toss the vegetables together with the prawns (if using) and add the dressing. Top with chopped coriander.

2 tbs rice vinegar
4 tsp sesame oil
1 tsp caster sugar
1 tsp grated fresh ginger
Juice of half a lime
Pinch of salt
5 stalks celery, finely sliced
3 medium carrots, finely sliced
2 red chillis, seeds removed and finely sliced
10cm piece of daikon/mooli, finely sliced, or a handful of sliced radishes or kohlrabi
Spring onions, finely sliced
150g prawns, cooked (optional)
Small handful coriander, roughly chopped