Toast the black sesame seeds in a dry skillet over medium heat for 2-3 minutes, until fragrant. Be careful not to burn them.
Let the sesame seeds cool, then grind them into a fine powder using a mortar and pestle or a coffee grinder.
In a bowl, whisk together the egg yolks, brown sugar, and vanilla sugar until light and fluffy.
In a saucepan over low heat, warm the heavy cream. Add the freshly ground black sesame powder and stir constantly until the sesame flavor is infused into the cream.
Slowly pour the sesame-infused cream into the egg yolk mixture, whisking constantly. Transfer the mixture to a heatproof bowl set over a simmering pot of water (double boiler). Cook, stirring constantly, for 5-7 minutes, or until the mixture thickens slightly.
Remove the cream mixture from the heat and let it cool completely. If desired, strain it through a fine-mesh sieve to remove any sesame seed particles.
Pour the cooled mixture into a freezer-safe container and freeze for at least 4 hours, or until the parfait is solid.
Before serving, garnish the top of the parfait with a sprinkle of toasted black sesame seeds for an even more intense flavor.
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