Pour the Guinness into a slow cooker. Add the contents of the seasoning packet from the corned beef, bay leaves, brown sugar, beef bouillon, coriander, cloves, mustard powder, allspice and Worcestershire sauce. Stir to combine.
Add the corned beef with the fatty side up. Cook on low for eight to 10 hours until the corned beef is fork tender. To serve, slice against the grain or shred with two forks. Enjoy!
