In a small bowl whisk all of the stir fry sauce ingredients.
Salt and pepper the steak and then place in the stir-fry sauce bowl with one-half of the sauce and marinade for 10 minutes at room temperature.
Heat two teaspoons of avocado oil in a hot wok or skillet.
Add the sliced mushrooms and cook, stiring often for 2 minutes until slightly browned. Remove the mushrooms to a plate. Add the broccoli florets and stir-fry for 2 minutes until slightly tender. Reserve to the plate with the mushrooms.
Wipe down the wok or skillet with paper towel and add 1 tablespoon of avocado oil to heat. Place the beef strips in the wok and separate to seer, flip once, cooking about 2 minutes per side. Remove the wok or skillet from the heat. Push to the side and add the garlic for cook for just 30 seconds.
Return to the heat, add the remaining sauce to the hot pan and stir for 30 seconds until slightly thickened. Add back the broccoli and mushrooms and toss to coat for 1 minute until heated. Serve hot!
The dish can be made without the mushrooms if you want a classic Beef and Broccoli Stir-fry. Feel free to top with green onions or sesame seeds for presentation.