In a small dish, combine a little cherry juice with sugar and cornstarch. In a skillet, heat juice from cherries over moderate heat. Add cornstarch mixture. When juice thickens, add cherries to warm through. Pour in warmed liqueur, then flame the pan to burn off alcohol. Remove cherries from heat. Scoop vanilla ice cream into large cocktail glasses or dessert dishes and spoon cherries down over ice cream.
Recipe courtesy Rachael Ray