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Mix oyster sauce, soy sauce, white sugar, Chiu Chow Style Chilli Oil and water in a small ramekin and set aside.
Heat wok on high heat and add 3 tbsp of cooking oil.
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Cook prawns for a couple of minutes or until the colour changes to pink (they don’t have to be fully cooked at this stage). Remove prawns and set aside. Keep the leftover oil in the wok.
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Add the ginger and garlic to the wok and sauté for a minute (add a bit more oil if needed). Add capsicum and broccoli and cook for another minute. Then add mushrooms and cook for 2-3 minutes.
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Pour the oyster sauce mixture into the wok. Once the sauce starts to bubble, put the cooked prawns back in the wok and cook for another 1-2 minutes, or until the sauce is thickened and coating all the vegetables and prawns. Alternatively, mix in the potato starch and water to thicken the sauce.
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Garnish with sliced spring onions and roasted cashew nuts and serve with steamed rice.
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If you like, you can make pickles and serve with this dish, by whisking together rice vinegar, white sugarand salt in a small bowl. Pack the sliced cucumber, radishes and chopped dried chilli into a glass jar and pour the mixed vinegar on top to cover the vegetables. Refrigerate for at least 12 hours.