Begin by cutting steak into thin ¼ inch thick strips, against the grain.
Place it into a large ziptop bag, cover with the cornstarch, seal, and shake the bag to move the beef around to ensure it is evenly coated; set aside momentarily.
In a medium mixing bowl, combine the soy sauce, brown sugar, water, mix; set aside.
In a large sauté pan, heat the oil over medium to medium-high heat. When the oil is shimmering, add the beef, evenly spaced, and sear for one minute on each side.
Remove the steak from the pan and set aside after it’s cooked taking care not to overcook; don’t crowd the pan and cook in batches if you need to.
Taking care that you only have about 1 tablespoon oil leftover in the pan after removing the steak (drain off excess if there is), add the peas (I added straight from the freezer), carrots, bell pepper, scallions, and sauté for 2 to 3 minutes.
Add garlic, ginger, sesame seeds, and sauté for an additional 1 minute, or until fragrant, stirring nearly constantly.
Add the seared steak back into the skillet, pour the soy sauce mixture over everything, and let it simmer for about 2 minutes to allow the sauce to thicken.
Scoop around 1/2 cup cooked rice into serving bowls, spoon the beef and vegetables over the rice, and if desired add salt, pepper, or additional soy sauce to taste before serving.
Recipe is best warm and fresh but will keep airtight in the fridge (store rice separately) for up to 4 days or in the freezer for 3 months, noting that the texture of the vegetables will change and they will be softer and not as crisp.