Add the beef stew meat to the slow cooker.
Pour in the soy sauce, then add the ginger, garlic, onion, carrots, beef broth, and brown sugar.
Stir everything together to coat the meat and vegetables.
Cover and cook on low for 8 hours until the beef is tender.
In the final 30 minutes of cooking, stir in the bok choy.
Mix the cornstarch slurry into the stew and stir until it thickens slightly.
Serve the stew over cooked rice.