Mongolian Beef Udon Noodles

Name: Mongolian Beef Udon Noodles
Cook time: 10 min
Total time: 10 min
Yield: 15 minutes
Ingredients: 400g beef sirloin or flank steak, thinly sliced; 2 x 200g pre-cooked packets udon noodles; 1 tbsp cornflour; 2 tbsp vegetable oil; 1 onion, thinly sliced; 1 red capsicum, thinly sliced; 1 bunch spring onions, cut into 5cm lengths; 4 cloves garlic, finely chopped; 1 tbsp ginger, finely chopped; Stir-fry Sauce:; ¼ cup soy sauce; 2 tbsp dark sweet soy sauce; 2 tbsp hoisin sauce; 2 tbsp oyster sauce; 1 tbsp sugar; 1 tsp sesame oil; ½ cup water