Using a wire strainer, drain liquid of the sour cherries into a saucepan.
With the back of a spoon, squeeze any remaining liquid from the cherries.
Add remaining ingredients to the cherry liquid.
Stir to completely dissolve the jelling mix.
Place saucepan over medium heat; cook and stir until the mixture boils.
Reduce heat and boil for a minute.
Allow to cool for 5 minutes.