Prep beef by cutting into 1-inch pieces.
In a large bowl, whisk together 2 tablespoons cornstarch with 3 tablespoons water. Add the cut beef to the bowl and toss to combine.
In a separate small bowl, whisk together the remaining 1 tablespoon cornstarch with the Aminos or soy sauce and sugar. Add in minced garlic and grate in the ginger. Set the sauce aside.
In a large cast-iron skillet or pan add 1 tablespoon of the oil over medium heat. Once it is hot, add the beef and cook, stirring constantly until the beef is almost cooked through about 4-6 minutes. Transfer the beef to a plate and set it aside.
Add the remaining 1 tablespoon of oil to the pan and once it is hot, add the broccoli florets and cook, stirring occasionally, until the broccoli is tender, about 4 minutes.
Return the beef to the pan then add the prepared sauce. Bring the mixture to a boil and cook, stirring, for about 2 minutes or until the sauce becomes slightly thick. Serve with cauliflower rice or starch of choice like rice or noodles.