Place brisket and enclosed seasoning packet in Dutch oven with enough water to cover. Simmer, covered, about 1 hour. Add bacon; simmer 1 to 1-1/2 hours longer or until beef is tender.
Remove brisket from Dutch oven and keep warm. Discard bacon; strain stock. Return stock to Dutch oven. Add carrots and turnips; simmer for 10 minutes Add potatoes and onions; simmer for 15 minutes more. Add cabbage, simmer for 10-15 minutes or until tender. Return brisket to stock; heat through. Place meat on a large platter with vegetables around it.