½ tsp potato starch
75ml/2½fl oz ginger and spring onion water (made from the trimmings of fresh root ginger and spring onion, crushed with the side of a large knife and mixed with water)
sweet chilli sauce, to serve
½ tsp salt (to taste)
1 tsp sesame oil
15g/½oz sugar
vegetable oil, for deep-frying
pinch ground white pepper (to taste)
250g/9oz raw prawns, peeled
20g/¾oz white vegetable fat