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Preheat oven to 325˚F.
Submerge corned beef in cold water for 15 minutes. Drain and pat dry.
Place corned beef in a baking dish and add Guinness to the pan.
In a small bowl, stir together the brown sugar, mustard and seasoning packet that came with the corned beef. Rub this onto the top of the corned beef.
Cover the pan and bake for 4 hours, removing the cover for the final 30 minutes of cooking.
Remove from oven and allow the corned beef to rest for about 10 minutes before slicing.