1Cut off all but 1 inch of beet tops. Wash beets; leave whole with root ends attached. Heat 8 to 9 cups water, 1 tablespoon white vinegar (to preserve color) and salt (if desired) to boiling in 4-quart Dutch oven. Add beets. Cover and boil 40 to 50 minutes or until tender; drain. Cool, peel and slice beets.
2Mix cornstarch, sugar, salt and pepper in 3-quart saucepan. Gradually stir in water and vinegar. Cook, stirring constantly, until mixture thickens and boils. Boil and stir 1 minute.
3Stir in beets; cook until hot.