Steps
1. Heat olive oil in a skillet over medium-high heat.
2. Add the garlic and ginger, sauté for 30 seconds until fragrant.
3. Add the beef slices, season with salt and pepper, and stir-fry until browned, about 3-4 minutes.
4. Add the onion, bell pepper, and broccoli to the skillet, stir-fry for another 4-5 minutes until vegetables are tender-crisp.
5. Pour in the gluten-free tamari sauce, stir to combine, and cook for another minute.
6. Remove from heat and sprinkle with sesame seeds and chopped green onion if desired.
7. Serve immediately.