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In a small sauce pan heat cherries, butter, and vanilla. Cook on medium heat until the cherries release their juices and begin to simmer (about 10 minutes).
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At this point you can blend the cherries for a smooth filling and return the puree to the pan, or you can leave it chunky and continue to cook on medium low.
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In a tiny dish, combine the water and cornstarch to create a paste.
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Add the cornstarch paste to the cherry mixture and stir until it has thickened up enough to coat the back of the spoon.
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Remove from heat and allow to cool.
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While the cherries are cooling, make your almond paste balls.
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Roll small ½ inch balls to top the tart.
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After cherry filling has cooled for about 10 minutes, pour filling into tart shell.
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Top cherry filling with almond paste balls.
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Bake for an additional 20 minutes at 350 degrees.
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Sprinkle with powdered sugar before serving.