Black Pepper Beef

Name: Black Pepper Beef
Prep time: 15 min
Cook time: 15 min
Total time: 30 min
Cuisine: Asian
Ingredients: 450 g (1lb) thin steak (, sliced thinly, against the grain (I use sirloin)); 2 tsp freshly ground black pepper; 1/4 tsp salt; 4 tbsp sunflower oil; 1 tsp sesame oil; 2 medium sized onions (peeled and chopped into thick slices); 1 green bell pepper (deseeded and sliced); 1 red bell pepper (deseeded and sliced); 2 tbsp cornflour ((cornstarch)); 2 tbsp dark soy sauce; 2 tbsp oyster Sauce; 1 tbsp Chinese rice wine ((or replace with dry sherry)); 120 ml (1/2 cup) beef stock; 2 cloves garlic (peeled and minced); 1 tsp minced ginger; Boiled rice