Mix sugar and cornstarch in 1-quart saucepan.
Add enough water to reserved liquid to measure 3/4 cup; stir into sugar mixture.
Cook, stirring constantly, until mixture thickens and boils.
Boil and stir 1 minute.
Stir in kirsch and food color.
Cut cherries into halves; stir into filling.
Refrigerate until completely chilled.