Heat a wok or large frying pan over medium-high heat. Add 1 tablespoon sunflower oil, 1/2 onion, sliced, 1/4 red pepper, deseeded and roughly chopped, 1/4 green pepper, deseeded and roughly chopped, 1 small handful tinned bamboo shoots, rinsed and drained (about 25 grams) and 1 small handful tinned water chestnuts, rinsed and drained (about 25 grams). Stir fry for 1 minute. Add 1 portion chicken for Chinese takeaway style stir fry dishes, pinch white pepper and 1/4 teaspoon MSG and mix well. Add 1 tablespoon chopped garlic in oil, 1 tablespoon hot bean sauce and 1/4 teaspoon dark soy sauce. Add the prepared sweet and sour sauce, mix well and simmer for 2 minutes until the sauce reduces slightly.