Place the pork shoulder chunks, potatoes, carrots, onion, and garlic into the slow cooker.
Stir together the gochujang, beef broth, soy sauce, and sesame oil in a bowl until smooth.
Pour the sauce mixture over the ingredients in the slow cooker and stir to coat everything evenly.
Cover and cook on low for 8 hours until the pork is tender and the vegetables are soft.
Stir the stew gently before serving, then top each bowl with sliced green onions and sesame seeds.