Add pitted cherries to a saucepan along with the sugar and cornstarch. Add maraschino cherry juice. Stir to combine. Turn heat up to medium-high.
Cook until it just begins to boil, then reduce heat to simmer. Stir and cook for up to 3 minutes, until the sauce thickens.
Let it cool for several minutes. Then transfer to a glass jar, cover tightly, and refrigerate. It will keep in the fridge for up to 5 days.
Notes
You can depth of flavor and texture by adding other types of cherries to the mix. For example, try adding a cup of sour cherries to the mix.For tips on creating a lattice top to your pie, check out this vegan apple pie recipe.