Clean the sundae (Korean blood sausage) and offal thoroughly, then cut them into bite-sized pieces.
Julienne onion, green onion, carrot, and cabbage.
Heat cooking oil in a pan and sauté minced garlic.
Add the offal and stir-fry over high heat.
Add the sundae and prepared vegetables, and stir-fry together.
Season with salt and black pepper.
Finish by adding perilla oil and ground perilla seeds.