01 -
In the slow cooker, combine diced onion, crushed garlic, minced ginger, rice wine vinegar, sesame oil, soy sauce, beef stock, brown sugar, and red chili flakes. Stir until well mixed.
02 -
Add chuck beef cubes to the slow cooker and toss to coat evenly with the sauce mixture.
03 -
Cover and cook on low heat for 8 hours, or until the beef is tender and flavorful.
04 -
In a small bowl, whisk together cornstarch and water until smooth to form a slurry.
05 -
Stir the slurry into the slow cooker, increase heat to high, and cook for an additional 30 minutes until the sauce thickens to desired consistency.
06 -
Serve hot, optionally garnished with sliced green onions and sesame seeds. Best accompanied by steamed rice and vegetables.