Beef Teriyaki Stir Fry

Ingredients

• ["1/4 cup soy sauce", "1 teaspoon dark sesame oil", "1 tablespoon brown sugar", "1 tablespoon ginger peeled and minced", "2 tablespoons scallions chopped", "1 teaspoon garlic minced", "2 teaspoons sesame seeds toasted", "2 cups broccoli florets", "1 cup mushrooms chopped", "1 cup red bell pepper sliced", "1/2 pound beef sirloin or flank steak, cut into 1/2\" strips""