Creating Slow Cooker Korean Beef is a straightforward process. Follow these easy steps to prepare this delightful dish:

1. Prepare the Beef: Cut the beef chuck roast into 1-inch cubes and season with black pepper.
2. Mix the Sauce: In a bowl, combine soy sauce, brown sugar, rice vinegar, sesame oil, minced garlic, and minced ginger. Stir until the sugar is dissolved.
3. Add to Slow Cooker: Place the seasoned beef in the slow cooker and pour the sauce mixture over it. Add the beef broth for extra moisture.
4. Set the Cooker: Cover the slow cooker and set it to cook on low for 6 to 8 hours or on high for 3 to 4 hours.
5. Thicken the Sauce: If desired, mix cornstarch with a little water to create a slurry. Add this to the slow cooker during the last 30 minutes of cooking to thicken the sauce.
6. Check for Doneness: Ensure the beef is tender and cooked through. It should easily shred with a fork.
7. Serve: Once cooked, stir the beef and sauce to combine. Taste and adjust seasoning if needed.
8. Garnish: Serve the beef hot, garnished with chopped green onions and sesame seeds.

These steps will guide you in creating this incredible dish effortlessly.