Pit 5 cups of fresh picked cherries (if pitting cherries is not your thing, you can use pitted cherries from the frozen food section.
Add pitted cherries, water, lemon juice, sugar, and cornstarch to a sauce pan and bring to a boil over medium heat, stirring often.
Once the mixture has come a boil, reducer the heat to a simmer and stir until the filling becomes thick.
(Optional) Once the pie filling has cooled, add a dash of vanilla and cinnamon for a next level flavor!