Freeze the steak for 1 hour. *this helps make thinly slicing the steak much easier and more uniform*
Add marinade ingredients to a ziplock. (¼ cup soy sauce, minced garlic, ginger powder, rice wine vinegar)
Thinly slice the steak into ¼” strips. Add steak to a ziplock with marinade and massage the marinade into the steak. let sit at room temperature for 1 hour.
After 1 hour, add salt, pepper, sesame oil, and cornstarch to the ziplock with the steak. Shake until combined and steaks are coated.
Heat a saucepan and a wok over medium high heat
Add the steak to the wok. Cook for 6 minutes. Turn the steak over halfway through.
Meanwhile, prepare the sauce. Add oil to the saucepan. Next add minced garlic and grated ginger. Sauté for 1 minute. Add the brown sugar and shaoxing wine and stir, cook for 1 minute. Next add soy sauce and gochujang. Whisk well and cook for 3 minutes.
Combine cornstarch and water to make a slurry, then pour into the saucepan. Whisk and cook until thickened, about 2-3 minutes. Remove from heat and pour into the wok over the steak. Toss to coat. Stir in the green onions and cook for 2 more minutes.
Garnish with sesame seeds and serve over rice. Enjoy!