• Place the steak in a gallon freezer bag and add 2 cups of teriyaki marinade. Seal and set aside in the refrigerator to marinade at least 1 hour up to overnight.

Make Stir Fry Sauce

• When ready to cook, in a separate small bowl combine the soy sauce, brown sugar, ginger, and 1 tablespoon of cornstarch and whisk together. This is the sauce that will go over the stir fry at the end. Set it aside for now.

Make Stir Fry

• Make the seasoning for the beef. Combine 4 tablespoons cornstarch, 1 cup water, and 1 teaspoon garlic powder in a small bowl.
• Take the meat out and slice into strips.
• Heat a wok over medium high heat on the stove and add 3 tablespoons of oil.
• Mix the slices of beef into the seasoning, coating evenly and stir fry in the oil until nicely browned. Cook in batches and set aside in a separate plate as you go.
• Stir fry the onion, asparagus, and broccoli in the remaining oil for about 4 to 5 minutes.
• Add the bell peppers and cook until it is desired tenderness.
• Add back the beef.
• Drizzle the stir fry sauce over the meat and veggies and cook until desired doneness.