Sundae is a traditional Korean sausage made from a mixture of pig's intestines stuffed with various ingredients such as noodles, pork blood, and vegetables. The sausage is then steamed or boiled until cooked through and served with a side of rice, kimchi, and other banchan. Sundae has a unique texture and flavor, with a combination of chewy noodles, rich pork blood, and savory seasonings. It is a popular street food in Seoul and is often enjoyed as a snack or a light meal.