Tender Beef Bao Buns

Ingredients

• 2 cups all-purpose flour
• 1 tablespoon sugar
• 1 tablespoon active dry yeast
• 1/2 teaspoon salt
• 3/4 cup warm water
• 1 tablespoon vegetable oil
• 1 tablespoon sesame oil
• 1/2 pound beef (flank steak or chuck)
• 1 tablespoon soy sauce
• 1 tablespoon hoisin sauce
• 1 tablespoon oyster sauce
• 1 tablespoon rice vinegar
• 1/2 tablespoon sugar
• 1/4 teaspoon ground black pepper
• 2 cloves garlic, minced
• 1 tablespoon ginger, grated
• 2 green onions, chopped
• 1 tablespoon cornstarch
• 1 tablespoon water
• 1/4 cup cilantro leaves