Stir fried beef and onions

1) Cut the beef into thin slices, about the size of a postage stamp.
2) Mix the beef with the soy sauce, sherry and cornflour and leave the mixture to marinate for about 20 minutes.
3) Roughly chop the slices of ginger root.
4) Heat the oil in a wok or frying pan until hot, then add the ginger, spring onions and onion and stir.
5) Add the beef. Stir constantly and keep the heat high.
6) As soon as the beef pieces have separated from each other, arrange them on a hot serving dish and serve at once.