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Cook cherries, 2 tablespoons of granulated sugar and 2 tablespoons of water in a small saucepan over medium low heat for about 15 minutes, always stirring. Make sure to use the back of your spoon to mash the cherries as they cook.
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Remove from heat once cherries are falling apart and liquid looks thickened and darkened.
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Place contents of the cherry mixture in a small blender and puree until smooth. You should obtain about 1/4 cup of cherry puree, in case you don’t want to cook your own cherries and use some cherry pre-made jam instead.
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Whisk egg yolk and 1/4 cup sugar. Add cornstarch and whisk to combine.
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Bring milk to a boil in a small saucepan (you can use the same pan you used to cook the cherries).
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Slowly add one tablespoon of milk to sugar and yolk mixture., while whisking. Keep adding the milk little by little until it’s all combined. This is called tempering the egg.
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Once all milk is combined with the egg, add cherry puree to the mixture. Whisk to combine.
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Transfer mixture back to small saucepan.
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With a wooden spoon or spatula, start stirring the mixture over medium heat. Bring it to a boil.
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Let mixture cook for about 3 minutes, don’t stop stirring.
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Once custard is thick, remove it to a small bowl. Add vanilla and butter in. Stir to combine. Cover with a plastic wrap, placing the wrap directly on the surface of the pastry cream. Place in refrigerator until ready to use.
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Storage: Pastry Cream will last for about 3-4 days in the fridge.