Step 1

Pour 1 bottle Irish stout beer into a slow cooker.

Step 2

Rinse corned beef brisket and pat dry. Rub with brown sugar, including the bottom, and gently place brisket into the slow cooker with the stout beer.

Step 3

Arrange sweet potatoes, cabbage, onion, carrots, and red potatoes on and around the brisket in the slow cooker.

Step 4

Pour remaining 1/2 bottle Irish stout beer on and around brisket and vegetables to moisten the brown sugar. Cover the cooker and cook on Low until corned beef is tender, 6 to 8 hours. Allow brisket to stand 5 minutes before slicing.