In a small bowl, whisk together the tamari, beef broth, sesame oil, rice vinegar, arrowroot powder, black pepper, and red pepper flakes until smooth. Set aside.
Cook the Beef and Broccoli
Heat 1 tablespoon avocado oil in a large skillet over medium-high heat. Add the sliced beef and cook for 3 to 4 minutes until browned. Remove from the skillet and set aside.
Add the remaining tablespoon of oil to the skillet. Stir in the broccoli florets and cook for 4 to 5 minutes until slightly tender but still crisp.
Add the garlic, ginger, and green onions. Cook for 1 minute until fragrant.
Return the beef to the skillet and pour in the sauce. Stir well to coat everything evenly.
Cook for another 2 to 3 minutes until the sauce thickens slightly and the beef is fully cooked through.
Serve hot on its own or with cauliflower rice for a low-carb meal.
Notes
Tamari keeps the sauce lower in sugar and gluten-free compared to many bottled stir-fry sauces.
Flank steak, sirloin, or even ground beef work well in this recipe.
Store leftovers in an airtight container in the refrigerator for up to 3 days.
Add sliced mushrooms or bell peppers for extra vegetables without adding many carbs.