1-Step One: Prepare the Beef Coating Start by whisking 2 tablespoons of cornstarch with 3 tablespoons of water in a large bowl. This creates a slurry that will coat the beef pieces. Add the thinly sliced flank steak to the bowl and toss well to coat every piece evenly. This technique, called “velveting,” is a Chinese cooking method that creates a protective barrier around the meat, keeping it incredibly tender during high-heat cooking. The cornstarch coating seals in juices and prevents the beef from becoming tough.

2-Step Two: Mix the Sauce In a separate small bowl, combine the remaining 1 tablespoon of cornstarch with the low-sodium soy sauce, packed light brown sugar, minced garlic, and grated fresh ginger. Whisk until the cornstarch completely dissolves, which prevents lumps from forming when the sauce thickens. Set this mixture aside while you cook the beef and vegetables. The sauce components work together beautifully: soy sauce provides saltiness and depth, brown sugar adds sweetness and promotes browning, while garlic and ginger contribute aromatic complexity.

3-Step Three: Sear the Beef Heat 1 tablespoon of vegetable oil in a large nonstick pan over medium heat. A properly preheated pan is crucial for achieving a good sear on the beef. Once the oil shimmers, add the coated beef pieces in a single layer. Avoid overcrowding the pan, as this causes steaming rather than searing. Cook the beef, stirring constantly, for about 2-3 minutes until nearly cooked through but still slightly pink in spots. Remove the beef from the pan and set it aside on a plate. The beef will finish cooking when you return it to the pan with the sauce.

4-Step Four: Cook the Vegetables Add the remaining 1 tablespoon of vegetable oil to the same pan. Add the broccoli florets and sliced white onions. Cook, stirring occasionally, for about 4 minutes until the broccoli becomes tender-crisp. You want the broccoli to retain some bite and its vibrant green color. If you prefer softer broccoli or want to speed up cooking, blanch the florets in boiling water for 1-2 minutes before adding them to the pan. Pat them dry thoroughly before stir-frying to prevent excess moisture from watering down your sauce.

5-Step Five: Combine and Sauce Return the seared beef to the pan with the cooked vegetables. Give the sauce mixture one final whisk to redistribute any settled cornstarch, then pour it over the beef and broccoli. Increase the heat slightly to bring the sauce to a boil. Once boiling, stir constantly for about 1 minute until the sauce thickens and coats all the ingredients in a glossy sheen. The cornstarch activates at boiling temperature, transforming the liquid into a silky sauce that clings to every piece.

6-Final Step: Serve and Enjoy Your beef and broccoli stir fry is now ready to serve! Transfer to a serving platter or divide among individual plates. This dish pairs perfectly with steamed white rice, brown rice, or Asian noodles. For a lower-carb option, serve over cauliflower rice or enjoy on its own. Garnish with sesame seeds or sliced green onions if desired. This recipe serves 4 people and tastes best enjoyed immediately while the beef remains tender and the broccoli stays crisp.