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Put the stock in a saucepan over a low heat, add the sugar, vinegar, ginger and chilli, and bring to a gentle simmer. Add the tofu, sweetcorn and prawns, simmer gently for 2 mins, then pour in the egg mixture in a steady stream, stirring to make egg strands.
Pile some beansprouts in each bowl and ladle the soup over. Scatter over the spring onions and serve.