Beef in Oyster Sauce ( Thai Food)

This beef in oyster sauce with different mushrooms is perfect for dinner,sooo yummie!
Ingredients (4-6 persons)
450g rump steak
2tbsp soysauce
1tbsp cornflour
3tbsp veg. oil
1tbsp chopped garlic
1tbsp chopped ginger
225 oz mixed mushrooms(shiitake,oyster & straw)
2tbsp oyster sauce
1tsp sugar
4 spring onions,cut into short lenghts
freshly ground pepper
2 red chillies,cut into strips to garnish
Method
1.Slice the beef on the diagonal into long strips. Mix together the soy sauce& corn flour in a large bowl,stir in the beef and marinate for 2 hours.
2.Heat half the oil in a wok or frying fan.Add the garlic & ginger &fry until fragrant. Stir in the beef. Stir to separate the strips,let them color & cookfor 1-2 mins.Remove from the pan & set aside.
3.Heat the remaining oil in thewok.Add the shiitake,oyster & straw mushrooms.Cook until tender.
4.Return the beef to the wokW/ the mushrooms. Add the oyster sauce,sugar & freshly ground black pepper to taste. Mix well.
5.Add the spring onions, mix together .Served garnished w/strips of red chili.