Heat a wok or large frying pan over a medium-high heat. Add 1 tablespoon sunflower oil. Add 12 slices cooked char siu , 1/2 onion, roughly chopped, 1/2 carrot, thinly sliced, 1 small handful tinned bamboo shoots, rinsed, drained and sliced, 1 small handful tinned water chestnuts, rinsed, drained and sliced and 1 handful raw cashew nuts. Stir-fry for 1 minute. Add 1 generous teaspoon chopped garlic in oil and stir fry for another 30-40 seconds. Add the prepared sauce, mix well and simmer for 1-2 minutes until the sauce reduces slightly. Add 1 teaspoon potato starch, mixed with 1 tablespoon water, stirring well (all of the mix may not be needed). Add 1 tablespoon rice wine and Dash sesame oil and mix well once more.