Combine the beef, onion, garlic, ginger and bulgogi sauce in a slow cooker. Cover and cook on HIGH for 3 hours 30 minutes or until beef is almost tender.
Place the cornflour and 1 tsp water in a small bowl and stir to combine. Stir into beef mixture and cook, covered, for 30 minutes or until sauce has thickened and beef is tender.
Top beef with shallots and sesame seeds and serve with steamed rice.
