Udon Noodle and Beef Stir Fry

Name: Udon Noodle and Beef Stir Fry
Ingredients: ⅓ cup chicken broth; ¼ cup low-sodium soy sauce; 3 tablespoons oyster sauce; 1 ½ tablespoons cornstarch; 1 tablespoon brown sugar; 2 teaspoons rice vinegar; 2 teaspoons Shaoxing wine or dry sherry (optional); 1 teaspoon toasted sesame oil; 1 to 2 teaspoons chili garlic sauce (optional); 1 to 1 ½ pounds skirt steak or chuck steak (sliced thinly (⅛ to ¼ inch thick)); 1 tablespoon cornstarch; ¼ teaspoon baking soda; 3 tablespoons stir fry sauce (from above); 14 ounces refrigerated udon noodles (discard the seasoning packet); 2 tablespoons vegetable oil; 5 garlic cloves (minced); 2 teaspoons grated fresh ginger; 3 scallions (white parts sliced thin, green parts cut into 1-inch pieces); 1 large carrot (julienned or cut into matchsticks); 8 ounces fresh mushrooms (sliced (shiitake or button work well)); 2 tablespoons toasted sesame seeds (optional, for garnish); 2 small red chilies (thinly sliced (optional, for garnish))