Whisk together the beef broth, soy sauce, brown sugar, garlic, ground sesame seeds, rice vinegar, ginger, gochujang and white pepper.
Place the beef, carrot, onion and bell pepper in the slow cooker. Pour over the sauce and stir to combine.
Cover and cook on medium for approximately 4 hours, or until the beef is tender. Slow cooker temperatures vary, so allow extra time if needed.
Whisk the cornstarch with 6 tablespoons of hot cooking liquid until smooth, then stir the slurry into the slow cooker.
Cover and cook on high for approximately 30 minutes, or until the sauce thickens.
Serve over white rice, garnished with chopped coriander and toasted sesame seeds.