Place the pork shoulder chunks into the slow cooker.
In a bowl, stir together the gochujang paste, soy sauce, brown sugar, minced garlic, grated ginger, rice vinegar, and beef broth until smooth.
Pour the sauce mixture over the pork and turn the pieces to coat them evenly.
Cover and cook on low for 8 hours, until the pork pulls apart easily with a fork.
Shred the pork directly in the slow cooker and stir it through the sauce to absorb the flavors.
Spoon the pork over bowls of cooked white rice.
Top each bowl with sliced green onions and sesame seeds before serving.