Place corned beef and seasoning packet in large heavy pot; add water. Bring to a boil and simmer for 1 hr.
Add onions and carrots. Bring back to a boil and skim off fat.
Add remaining ingredients, reduce heat to medium-low and cover. Simmer approximately 2 to 4 hrs. until beef is tender. When brisket pierces easily, it is ready.
Drain the water, place brisket on a platter and let stand about 10 mins.
Slice diagonally across the grain and serve with cabbage, carrots and onion.