Soak the pork ribs in cold water for 1 hour to remove the blood.
Cut potatoes, carrots, and onions into bite-sized pieces.
Make a marinade with soy sauce, gochujang (Korean chili paste), red pepper powder, sugar, minced garlic, minced ginger, and black pepper.
Put the pork ribs, marinade, and water in a pot and bring to a boil.
Add potatoes and carrots, then simmer over medium-low heat for 20 minutes.
Add onions, green onions, and spicy green chilies, and simmer for another 10 minutes.
When the broth thickens, finish by adding sesame oil and sprinkle with sesame seeds.