Thoroughly wash the sundae (Korean blood sausage) and pork offal.
Cut onions, green onions, garlic, and other vegetables into bite-sized pieces.
Boil water in a pot, add a pinch of salt, then blanch the sundae and offal for 5 minutes.
Cut the blanched sundae and offal into bite-sized pieces.
Heat sesame oil in a pan, stir-fry the garlic, then add the offal and sundae and toss together.
Season with salt and pepper.
Add the onions and green onions and stir-fry briefly.
Plate and sprinkle with perilla seed powder to finish.