Gochujang Pulled Pork in the Slow Cooker

Name: Gochujang Pulled Pork in the Slow Cooker
Ingredients: 0.66666668653488 cup gochujang (Korean hot pepper paste); 1 large onion, thinly sliced; 0.5 cup apple cider vinegar; 0.5 cup chicken stock; 0.25 cup honey; 0.25 cup brown sugar; 2 tablespoons fresh ginger; 1 tablespoon soy sauce; 1 tablespoon yellow mustard; 3 cloves garlic, minced; 1 tablespoon ground cinnamon; 1 teaspoon salt; 5 sprigs thyme, stemmed; 0.5 teaspoon ground black pepper; 1 (4 pound) boneless pork shoulder roast, trimmed; 0.25 cup butter, divided; 1 tablespoon all-purpose flour; 8 hamburger buns, split; 3 green onions, thinly sliced