Place the steak strips, soy sauce, light brown sugar, 3 tablespoons of sesame oil, minced garlic, ground ginger, and red pepper flakes, optional, in a large, sealable plastic bag. Seal the bag and slosh everything around until the marinade is well mixed and the steak is all coated with it.
1½ pounds thin-cut beef bottom round steak, ⅓ cup low-sodium soy sauce, ¼ cup light brown sugar, 5 tablespoons sesame oil, 2½ teaspoons minced garlic, 2 teaspoons ground ginger, ¾ teaspoon crushed red pepper flakes
Remove any excess air from the bag and reseal and then place it in the refrigerator to marinate for at least 2 hours.
When ready to cook, heat the remaining 2 tablespoons of sesame oil in a large skillet set over medium-high heat.
Add in the marinated meat and as much marinade as desired, and cook for 2-3 minutes per side, or until cooked through.
Once the meat is fully cooked, remove it from the pan and mix the cornstarch in a small bowl with 2-3 tablespoons of the hot marinade.
1-2 tablespoons cornstarch
Pour the cornstarch slurry into the skillet with the marinade sauce and bring to a boil.
Boil for 1 minute or until thickened, don’t over cook.
Pour the hot, thickened sauce over the cooked meat and serve hot with a garnish of sesame seeds, green onions, optional and a side of white rice, optional.
3 teaspoons sesame seeds, Minced green onions, Cooked white rice