This gluten free beef and broccoli is a flavorful weeknight favorite that rivals your go-to takeout. It's easy, satisfying, and perfect for the whole family.
Place the sliced flank steak in a bowl and toss it with 2 tablespoons of cornstarch until evenly coated. This helps create a light crust and thickens the sauce later. Set aside for 10 minutes while you prep the rest.
Whisk together the tamari, brown sugar, rice vinegar, sesame oil, and beef broth in a small bowl. In a separate tiny bowl, stir together the remaining 1 tablespoon of cornstarch with 2 tablespoons of water to make a slurry. Set both aside.
Heat 1 tablespoon of avocado oil in a large skillet or wok over high heat until the oil shimmers. Add the steak slices in a single layer, working in batches if needed, and sear for 1 to 2 minutes per side until browned. Transfer the beef to a plate.
Add the remaining 1 tablespoon of avocado oil to the skillet. Add the broccoli florets and cook for 3 to 4 minutes, stirring occasionally, until bright green and slightly charred on the edges. Add the garlic and ginger and stir for 30 seconds.
Pour in the sauce mixture and bring it to a simmer. Stir in the cornstarch slurry and let it cook for about 1 minute until the sauce thickens and becomes glossy.
Return the seared beef to the skillet and toss everything together, coating the beef and broccoli in the sauce. Sprinkle with sesame seeds and serve immediately over steamed rice.