01 - Toss beef strips with soy sauce, cornstarch, and sesame oil in a bowl. Let rest for 10 minutes.
02 - Combine all stir fry sauce ingredients in a small bowl and set aside.
03 - Heat 1 tablespoon vegetable oil in a large wok or skillet over high heat. Stir fry beef for 2 to 3 minutes until browned but not fully cooked. Remove and set aside.
04 - Add remaining oil to the wok. Stir fry garlic, ginger, and spring onions for 30 seconds until fragrant.
05 - Add broccoli and red bell pepper; stir fry for 2 to 3 minutes. Add a tablespoon of water, cover, and steam for 2 minutes until vegetables are crisp-tender.
06 - Return beef to wok, pour in stir fry sauce, and toss everything for 2 to 3 minutes until sauce thickens and beef is cooked through.
07 - Plate immediately, garnishing with extra spring onions or sesame seeds if desired.