Heat a wok or large frying pan over medium-high heat.  Add 1 tablespoon sunflower oil, 1/4 onion, sliced, 1/4 green pepper, deseeded and roughly chopped, 1/4 carrot, thinly sliced, 1 handful tinned bamboo shoots, rinsed and drained (about 30g) and 1 handful tinned water chestnuts, rinsed and drained (about 30g).  Stir fry for 1 minute.  Add 12 slices cooked char siu, pinch sea salt, 1/4 teaspoon MSG, 1 tablespoon chopped garlic in oil and 1/4 teaspoon crushed dried chilli flakes and mix well.  Add the prepared sauce and 200 millilitres light chicken stock.  Mix well, bring to the boil and simmer for 2 minutes until the sauce reduces slightly.