Mix together all of the marinade ingredients in a large bowl and add the beef.
Add the oil to the wok and heat until smoking.
Add the beef and quickly stir-fry for 2 minutes.
Drain the beef into a colander to get rid of the oil.
Put the wok back on the heat and add the onions followed by the beef stock and the mushrooms stir-fry until the onions are starting to soften and the mushrooms are cooked through.
Add in the chilli flakes, sugar and soy sauce and cook for a minute more.
Add in the gherkins.
Return the beef to the pan and add the chives.
Add sesame oil and stir well to combine.
Serve with the noodles
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