Your family will love this because it's better than takeout - you'll love it because it's quick to make and packed full of nutritious ingredients. Serve it over rice or noodles to soak up the delicious sauce.
In a bowl, whisk a little of the milk into cornstarch to make a smooth paste. Whisk in remaining milk, lemon zest, soy sauce, honey and hot pepper flakes; set aside.
Heat a wok or large skillet over high heat. Add beef and stir-fry for 3 minutes or until browned; transfer to a bowl. Add remaining butter to pan, then onion and stir-fry for 1 minute. Add broccoli and ginger and stir-fry for 3 minutes or until onion is tender. Return beef and accumulated juices to pan.
Whisk milk mixture and pour into pan. Cook, stirring and scraping up brown bits, for about 2 minutes or until thickened. Stir in lemon juice.
COOKING TIP: Grate the lemon zest and the ginger on the fine-side of a box cheese grater. Grating the ginger gets the most from the flavor in the short cooking time of a stir-fry.
Cut the prep time by buying precut beef stir-fry strips and pre-cut broccoli.