Stick cloves in onion. Place onion, beef, single carrot and cinnamon in 6-quart pot. Add enough water to cover ingredients. Bring to simmer. Cover; simmer 3 hours.
With slotted spoon, remove onion, carrot and cinnamon; discard. Add salt and cabbage to pot. Cook, covered, 15 minutes. Add carrots and potatoes; cook, covered, 15 minutes, until carrots and potatoes are tender.
Remove brisket; slice. Serve with vegetables. Drizzle with broth.