Place roast in large roaster pan.

Combine next 6 ingredients; sprinkle over roast.

Place onions around roast.

Pour water in pan.

Bake tightly covered, at 350* for about 3-1/2 hours until roast is almost tender.

Add more water if needed.

Add carrots and potatoes; bake for 1-1/2 hour more, until vegetables are tender.

Baste roast and vegetables with juices.

Thicken with flour and water mix if desired.