Pork intestines are filled with glass noodles and glutinous rice.
Sundae is also popular street food.
You can try it at Snack bar with tteokbokki on the street.
Sundae look like a sausage, but sundae is a little different. Sundae is basically steamed.
so some person does not eat sundae, they say some kind of smell.
Anyway I recommend try this one.
If you order Sundae, usually steamed pork lungs and steamed pork river come with Sundae.
Eating Sundae with Tteokbokki source is good.