Beef Teriyaki Stir Fry

Name: Beef Teriyaki Stir Fry
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Yield: 2
Ingredients: Ingredients; Beef; 1 lb beef sirloin or flank steak, thinly sliced; 2 tablespoons vegetable oil (for stir-frying); 1 tablespoon cornstarch (optional, for thickening sauce); 1 tablespoon water (for cornstarch slurry); 2 cups mixed vegetables (e.g., broccoli, bell peppers, carrots, snap peas); 3 green onions, chopped (optional); Sesame seeds (for garnish, optional); Teriyaki Sauce; 1/4 cup soy sauce (low sodium preferred); 1/4 cup water; 2 tablespoons brown sugar; 2 tablespoons honey; 1 tablespoon rice vinegar; 1 tablespoon sesame oil; 2 cloves garlic, minced; 1 tablespoon fresh ginger, minced (or 1 teaspoon ground ginger); 1 tablespoon cornstarch (for thickening sauce, optional)