Baked Char Siu Bao (Chinese Barbecued Pork Buns) - Kikkoman Home Cooks

Ingredients

• 2 tablespoons vegetable oil, divided
• 1 cup chopped onion
• 2-1/3 cups chopped Chinese barbecue pork (Char Siu)*, about 3/4 pound
• 2 tablespoons Kikkoman Stir-Fry Sauce
• 2 teaspoons tomato ketchup
• 1/2 teaspoon cornstarch
• 2 tablespoons water, divided
• 3-1/4 cups all-purpose flour (about), divided
• 1/4 cup sugar
• 1/2 teaspoon salt
• 1 package (1/4 oz.) rapid rise yeast
• 1/2 cup whole milk
• 1/2 cup water
• 1 egg
• 1 tablespoon sugar