0.33333334326744 medium head cabbage, coarsely chopped
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2 tablespoons butter
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2 tablespoons all-purpose flour
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1 cup beef broth
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0.5 cup Irish stout beer (such as Guinness®)
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2 tablespoons Dijon mustard
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1 teaspoon ground black pepper
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0.5 teaspoon salt
Instructions
Place onion and garlic in a slow cooker. Put corned beef brisket on top. Pour in water, then add bay leaves and spice packet. Cover and cook on Low for 8 hours, adding potatoes at the 3-hour mark, carrots at the 4-hour mark, and cabbage at the 6-hour mark.
Turn off the slow cooker. Remove brisket to a platter and tent with aluminum foil for 10 minutes to let juices settle.
Meanwhile, melt butter in a saucepan over medium-low heat. Stir in flour to make a roux; cook to burn out any flour taste, about 5 minutes. Whisk in, a little at a time, beef broth, Guinness®, and mustard. Stir until gravy is thick enough to coat the back of a spoon. Stir in pepper and salt.
Slice meat across the grain and plate with cabbage, potatoes, and carrots. Ladle gravy over top.