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Heat a wok until smoking, pour in the oil then add beef. Stir-fry for 2 mins, then tip onto a plate. Add broccoli with a splash of water then cook until broccoli turns bright green.
Add the onion and stir-fry for 1 min, then add the garlic and cook for 1 min more. Pour in the oyster sauce and 125ml water. Bring to the boil and cook until reduced to a sticky sauce. Stir in the beef, along with any juices from the plate, then serve straight away.