Prepare the cooked rice: either cook it in advance before starting the wok session or make sure that enough cooked rice sits in the microwave to be heated during the wok session.
Cut the beef in strips; add the oyster sauce & let it marinate for some minutes.
Mince the ginger, press the garlic & chop the spring onions. Set aside the green part of the spring onions.
Chop the mushrooms into thin slices.
Mix the ingredients for the sauce & add water; at the end you shouldn’t have more than 300 ml altogether.
Prepare the wine resp. sherry.
Take a wok, add the peanut oil & heat it up.
When the oil starts jittering add the beef & stir-fry for about a minute.
Put the beef in a bowl & set aside.
Add the spring onions, the ginger & the garlic & stir-fry for about a minute.
Add the mushrooms & stir-fry for another minute.
Add the sauce, bring it to a boil & stir frequently. Most of the sauce shall vanish during the next 5-10 min when bubbling.
Add the beef & the sherry resp. wine for the finishing.
OPTIONAL: add sesame oil.
OPTIONAL: mix water & corn starch & add to the wok mess to thicken the liquid (spoonful by spoonful!).
Ready for serving.