Thoroughly wash the fresh blackberries and set them aside in a bowl.
In another bowl, whisk the egg yolks with the powdered sugar until you get a light and fluffy cream.
In a small saucepan over medium heat, heat the water. When it starts to boil, add the blackberries and cook for 5-6 minutes, until the fruit softens and the juice thickens slightly.
Strain the cooked blackberry puree to remove the seeds. Pour the thick juice into the egg yolk mixture while stirring constantly. Then, place the bowl over a double boiler and continue to stir until the mixture thickens slightly.
In another bowl, whip the heavy cream until stiff peaks form. It's important that the cream is cold for easier whipping.
Slowly and gently fold the whipped cream into the egg yolk and blackberry mixture. Using a spatula, be careful not to deflate the cream and maintain a light and airy texture.
Pour the mixture into a bowl or silicone mold and place it in the freezer. Freeze for a minimum of 4-6 hours, but the flavors will meld even better if left to rest overnight.
5 minutes before serving, remove the parfait from the freezer to make it easier to slice. You can easily cut the parfait with a knife dipped in warm water.
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