1 (15 ounce) can dark Irish stout beer (such as Guinness®)
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2 medium heads garlic, cloves separated
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4 bay leaves
Instructions
Place brisket, fat-side down, into a slow cooker. Cover with hot water and cook on High for 1 hour. Drain and discard water from the slow cooker.
Add peppercorns, cloves, cayenne, and cinnamon to a tea ball or spice bag. Place in the slow cooker with beer, garlic cloves, and bay leaves. Add more water to just cover the brisket.
Cook on Medium for 5 hours. Remove brisket carefully; it will be very tender and may fall apart or break in half. Let meat rest before slicing.