Cherry pie filling is made from sour/tart cherries with lots of sugar and possibly gelatin. If you've never had it, it's tangy-sweet with a slightly sour bite (though it's more sweet than sour). You could probably substitute cherry preserves - add some liquid (water, white wine, or cherry juice) to it if the preserves are very thick. You can also make your own by cooking pitted sour cherries + sugar into a syrup and adding gelatin or pectin to thicken it a bit.
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