For the beef marinade
01 -
1.5 lb (680 g) flank steak, sliced thin against the grain
02 -
2 tablespoons soy sauce
03 -
1 tablespoon cornstarch
04 -
1 teaspoon sesame oil
05 -
1/2 teaspoon black pepper
For the sauce
06 -
3 tablespoons soy sauce
07 -
2 tablespoons oyster sauce
08 -
1 cup (240 ml) beef broth
09 -
1 tablespoon cornstarch
10 -
1 teaspoon sugar
11 -
1/4 teaspoon black pepper
For the stir-fry
12 -
2 tablespoons vegetable oil, divided
13 -
1 medium yellow onion, sliced into thin wedges
14 -
1 large red bell pepper, sliced into strips
15 -
1 large green bell pepper, sliced into strips
16 -
4 cloves garlic, minced
17 -
1 teaspoon fresh ginger, grated