Preheat oven to 220°C. Wrap each bulb of beetroot in a small sheet of foil. Place in a larger oasting pan. Cook 1 hour or until beetroot is very tender when pierced with a knife. Cool. Rub skins from beetroot. Discard. Cut beetroot into 1cm cubes.
In a large saucepan over a medium heat, place beetroot and remaining ingredients. Cook, stirring until sugar has dissolved. Bring to boil, reduce heat and simmer gently, uncovered, 1½-2 hours, stirring occasionally, or until mixture is rich and thickened. Discard spices if liked.