Prep the broccoli: Cut into bite-size florets.
If using fresh, rinse and pat dry. If using frozen, thaw and pat dry to avoid excess moisture.
Make the sauce: In a small bowl, whisk tamari or coconut aminos, vinegar, toasted sesame oil, garlic, ginger, and chili-garlic sauce. If using xanthan gum, sprinkle it in while whisking until just combined.
Brown the beef: Heat 1 tablespoon oil in a large skillet over medium-high.
Add ground beef, breaking it up with a spatula. Season with salt and pepper. Cook until mostly browned, about 5–6 minutes.
Drain excess fat if needed.
Cook the broccoli: Push the beef to one side. Add the remaining oil and broccoli to the empty space. Stir-fry 3–4 minutes, until bright green and crisp-tender.
Combine and sauce: Toss beef and broccoli together.
Pour in the sauce. Stir for 1–2 minutes, letting it bubble and coat everything. If you used xanthan gum, the sauce will thicken quickly—don’t overcook.
Taste and finish: Adjust salt, pepper, or heat.
Remove from heat. Top with green onions and sesame seeds.
Serve: Enjoy as-is, or spoon over cauliflower rice or toss with shirataki noodles for a complete keto bowl.