Add the sweet chilli sauce, sugar, sesame oil, soy, corn flour and stock to a sauce pan, stir well, bring to the boil and simmer until thickened. Reduce heat.
Add the oil to a wok, bring to the heat and add the prawns and mushrooms and cook until the prawns are pink all the way through and cooked.
Add the stir fry vegetables and fry for a few minutes until softened. Add the sauce to the wok and combine.
Serve on its own or with rice/noodles.
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