It is best if you can start with partially frozen meat. Take the frozen beef and slice it down the meat’s grain into 2” long sections. Take a sharp knife and place it at an angle against one of the strips. Cut the strip into thin 2” x 2” pieces and put them in a medium-sized mixing bowl.
Add the Shaoxing wine, soy sauce, sesame seed oil, and oyster sauce. Mix everything well with a fork. If soy is an issue for you, use tamari or coconut aminos.
Allow the meat to marinate at room temperature while you prepare the broccoli rice and garlic and ginger, which should be minced.
Add the broccoli florets to the bowl of a food processor. Start with filling the processor about halfway at first to see how your machine can handle the load. Process the broccoli until it is finely chopped but still has some texture. Remove the chopped broccoli rice to a large microwave-safe bowl.
Repeat with the remaining broccoli rice. Cover the broccoli rice with plastic wrap and microwave on high for 3 minutes.
Preheat a large nonstick skillet over medium-high heat until hot. Add the oil and swirl to coat. Add half of the meat (or less depending on the exact size of your skillet).
You want the sliced beef to be in a single layer. Cook the meat on the first side without stirring it for several minutes or until the bottom has browned. Stir it and cook until it is no longer pink.
Remove the cooked meat to a warm bowl and repeat with the remaining beef. Serve the beef over the heated broccoli rice.