Start by slicing your flank steak against the grain into thin strips for optimum tenderness. Marinate the beef with soy sauce, peanut oil, and cornstarch for 15 minutes.

While the beef marinates, whisk together all sauce ingredients in a bowl until the sugar dissolves completely.

In a nonstick skillet, heat water over medium-high heat. Steam the broccoli florets for 3-4 minutes until just tender and bright green.

Remove the steamed broccoli and set aside. Add peanut oil to the skillet, then the marinated beef in a single layer. Sear for 2-3 minutes until browned.

Stir in minced garlic and ginger, sautéing for 30 seconds until fragrant.

Return the steamed broccoli to the skillet and pour the prepared sauce over the mixture, stirring gently for 1 minute until thickened.

Transfer to a serving dish and serve hot over a bed of steamed rice or noodles.