Step 1

In a slow cooker, add the onion, garlic, ginger, rice wine vinegar, sesame oil, soy sauce, beef stock, brown sugar, and red chili flakes. Stir to combine.

Step 2

Add the beef and coat in the sauce.

Step 3

Cook on low for 8 hours or until the beef is tender.

Step 4

In a bowl, combine the cornstarch and water until it forms a paste. Pour into the slow cooker and mix into the sauce.

Step 5

Cook on high for 30 minutes or until the sauce has thickened.

Step 6

Serve & Enjoy.