Scallion pancake, or cong you bing, is a popular street food in Taipei. It is a savory pancake made from a dough that is layered with scallions and then pan-fried until crispy. The pancake is often served with a soy-based dipping sauce. Scallion pancake is a delicious and satisfying snack that is perfect for munching on while exploring the bustling streets of Taipei.