Prep: Start cooking white rice first so it's ready when the stir fry is done. Thinly slice the steak against the grain.
Make the Sauce: Combine all stir fry sauce ingredients in a bowl, stir well to dissolve the sugar, and set aside.
Cook Broccoli: Steam cook the broccoli until desired softness and set aside.
Cook Beef: Set heat to high heat and add 1 Tbsp sesame oil. Add beef in a single layer and sauté 2 minutes per side or just until cooked through. Quickly pull out a piece to test for doneness.
Add the sauce, reduce heat to medium/low and simmer 3-4 minutes. It will thicken. Add broccoli and stir to combine. Serve over white rice.