Beef and Broccoli Udon Noodles

Name: Beef and Broccoli Udon Noodles
Ingredients: 2 tablespoons sesame oil; 1 tablespoon cornstarch; 1 tablespoon soy sauce; 1/2 teaspoon salt; 1/4 teaspoon baking soda; 0.5 pound flank steak, sliced across grain 1/4-inch thick; 3 tablespoons mirin; 3 tablespoons water; 3 tablespoons soy sauce; 1 tablespoon dark soy sauce; 1 tablespoon sweet soy sauce; 1 tablespoon oyster sauce; 1 tablespoon rice vinegar; 1 head broccoli, broken into bite-sized florets; 20 ounces jumbo udon noodles; 3 cloves garlic, minced; 1 (1/2-inch) piece fresh ginger; 2 green onions sliced; 1 teaspoon black sesame seeds; 1 teaspoon toasted sesame seeds