Preheat oven to 325°F. Place brisket into a deep large roasting pan fat side up. Fill with hot water about 3/4 way up the side of brisket leaving fat cap exposed. (Amount of water will vary depending on the size of the pan. You can also replace some of the water with beer or low sodium beef stock.)
Add spice packet, bay leaves, granulated garlic and onion powder. Add a few dashes of Worcestershire sauce, if using. Sprinkle with freshly ground black pepper and top with a few sprigs of fresh thyme.
Cover pan with aluminum foil. Bake for 2 1/2 hours. After 2 1/2 hours, remove foil and add carrots, potatoes, onion and cabbage wedges. Recover and continue to bake for another 1 1/2 - 2 hours or until brisket is fork tender.
Meanwhile, in a small bowl, mix together whole grain mustard and honey.
Once corned beef is fully cooked and shreds easily, remove foil. Use a slotted spoon to remove cabbage wedges to a platter and keep warm.
Increase the oven temperature to broil. Slather the top with mustard and honey then broil for several minutes to char. Remove to a cutting board, let rest uncovered for 10 minutes.
Slice brisket and arrange on a platter with cabbage, potatoes, carrots and onion. (Strain cooking liquid to remove seasonings prior to serving)
Serve immediately garnished with fresh parsley or thyme with a drizzle of jus or whole grain mustard on the side.
Variation Southern Corned Beef and Cabbage: Cook 6 slices of bacon until crisp and render the fat. Drizzle the bacon grease over the vegetables after adding them to the pan, then proceed with the recipe. Crumble the bacon over the top for serving.