Pork Miso Udon

Name: Pork Miso Udon
Ingredients: 2 Tablespoons miso paste; 2 Teaspoons soy sauce; 1/2 Teaspoon cornstarch; 2 cloves fresh, ground garlic; 7 Ounces udon noodles; 1 Teaspoon sesame oil; 1/2 medium-sized onion, sliced lengthwise; 1 stalk bok choy, sliced thinly lengthwise; 1/2 Pound ground pork; One-half 15-ounce can sweet corn, drained; 2 Tablespoons unsalted butter; Sesame seeds, for garnish; 3 scallions, chopped finely, for garnish; Red pepper powder (optional)