Heat the oil in a wok, add the spring onions and ginger and stir-fry for 30 seconds. Add the prawns, mangetout, chilli powder, tomato purée, salt, sugar and sherry and stir-fry briskly for 5 minutes.
Sprinkle over the sesame oil and arrange on warmed individual plates. Serve immediately, garnished with whole prawns. Chinese Prawns in Chilli Sauce Recipe