Put the pork, beansprouts, mushrooms, spring onions, sugar and salt in a large bowl and toss well together. Blend the cornflour with the soy sauce and stir it into the pork mixture. Leave to marinate for not less than 30 minutes.
Add the pork, vegetables and marinade and stir-fry for 4 minutes, until most of the liquid has disappeared and the pork is cooked. Allow to cool.
Dip the rice papers one at a time into cold water to soften them and pat dry with a kitchen towel. Place
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