1: In a large dutch oven, add the corned beef.
2: Sprinkle with brown sugar and the seasoning packet that comes with the beef.
3: Add in the chopped garlic cloves.
4: Pour in the Guinness until the beef is 3/4 covered.
5: Put the lid on and bake at 350° for one hour.
6: Then reduce the temperature to 300° and bake for a total of 5-6 hours (one hour per pound).