Prepare the Beef: Season the beef chunks with black pepper for added flavor.
Mix the Sauce: In a bowl, combine beef broth, soy sauce, brown sugar, ginger, garlic, sesame oil, and gochujang. Mix well until the sugar dissolves.
Place in Slow Cooker: Add the seasoned beef to the slow cooker and pour the sauce mixture over the top.
Cook: Cover and set the slow cooker to low for 6-8 hours or high for 3-4 hours, until the beef is tender.
Prepare Noodles: About 15-20 minutes before serving, cook the noodles according to package instructions. Drain and set aside.
Combine: Once the beef is tender, add the cooked noodles to the slow cooker. Stir gently to combine and allow them to absorb some broth.
Serve: Scoop the beef and noodle mixture into bowls, garnishing with sliced green onions, sesame seeds, and cilantro if desired.
