01 -
Add diced onion, crushed garlic, minced ginger, rice wine vinegar, sesame oil, soy sauce, beef stock, brown sugar, and red chili flakes to the slow cooker. Stir thoroughly to blend.
02 -
Add beef cubes to the slow cooker and toss to coat the meat evenly in the marinade.
03 -
Secure the lid and cook on low heat for 8 hours, or until the beef is fork-tender.
04 -
In a small bowl, whisk cornstarch with water until fully dissolved. Pour the slurry into the slow cooker and stir well.
05 -
Set the slow cooker to high heat and cook for 30 additional minutes, or until the sauce has thickened to the desired consistency.
06 -
Plate the beef with sauce and garnish with sliced green onions and toasted sesame seeds as desired. Serve hot.