01 -
Rinse the corned beef brisket under cold water and pat dry with paper towels.
02 -
Place the quartered onion, crushed garlic, bay leaves, black peppercorns, and brown sugar at the base of the slow cooker.
03 -
Position the brisket fat-side up atop the aromatics. Sprinkle the included spice packet over the meat. Pour stout beer and beef broth over the brisket until nearly covered; add water if necessary.
04 -
Cover and cook on low heat for 6 to 8 hours until the brisket is fork-tender.
05 -
Add quartered potatoes and carrots to the cooker, submerging them in the liquid. Continue cooking on low for 1 additional hour.
06 -
Arrange cabbage wedges atop the meat and vegetables. Cook on low for another hour, until vegetables are tender and cabbage is cooked through.
07 -
Remove brisket and let rest on a cutting board for 15 minutes to redistribute juices. Remove vegetables with a slotted spoon and arrange on a serving platter. Slice brisket against the grain and serve with vegetables.