Original here.

Ingredients
3/4 pound flank or sirloin, sliced thinly across the grain
3/4 pound broccoli florets
2 tablespoons high-heat cooking oil
2 cloves garlic, very finely minced or smushed through garlic smusher
1 teaspoon cornstarch, dissolved in 1 tablespoon water

For the beef marinade
1 teaspoon gluten-free tamari (San-J makes a good one. Read the labels carefully - not all tamari is gluten free.)
1 teaspoon red wine vinegar (most people with gluten issues are fine with distilled vinegar. Some aren't. Honestly, the only way to figure this out is trial and error.)
1/2 teaspoon cornstarch
1/8 teaspoon freshly ground black pepper

For the sauce
2 tablespoons oyster sauce
1 teaspoon red wine vinegar
1 tablespoon gluten-free tamari
1/4 cup chicken broth (if you're using boxed or powdered stuff, read the labels. Yes, gluten can sneak into broth.)

Prepare as described.