Slice the flank steak into thin strips against the grain. In a bowl, combine the beef with 2 tablespoons of soy sauce and 2 tablespoons of cornstarch. Mix well and let marinate for at least 30 minutes.
Prepare the vegetables: wash and cut the broccoli, shred the carrots, and slice the red bell pepper and green onion. In a small bowl, whisk together the remaining soy sauces, brown sugar, garlic, and ginger.
Heat 2 tablespoons of cooking oil in a large skillet or wok over medium-high heat until shimmering.
Add half of the marinated beef to the skillet and stir-fry for about 3 minutes until browned. Remove from the skillet and repeat with the remaining beef.
Add all the prepared vegetables to the skillet and stir-fry for 3-4 minutes until tender-crisp.
Return the cooked beef to the skillet and pour the sauce mixture over everything. Stir well to combine and cook for an additional 2-3 minutes until heated through.
Garnish with sesame seeds and sliced green onions before serving over a bed of rice.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3-4 days.