In a medium saucepan, combine the milk, heavy cream, sugar, salt, and vanilla extract. Heat over low heat, stirring occasionally, until the mixture is warm but not boiling.
Meanwhile, in a separate bowl, whisk the egg yolks. Gradually add a ladleful of the warm milk mixture to the egg yolks, whisking constantly to temper the eggs.
Pour the egg yolk mixture back into the saucepan. Cook over low heat, stirring constantly, until the custard thickens slightly and coats the back of a spoon. This should take about 5-7 minutes.
Strain the custard through a fine-mesh sieve into a clean bowl. Let it cool to room temperature before refrigerating for at least 4 hours, or preferably overnight.
Pour the chilled custard into an ice cream maker and churn according to the manufacturer's instructions.
When the ice cream is almost done churning, add the chopped white chocolate and mix until evenly distributed.
Layer the ice cream into an airtight container, swirling in the raspberry puree and dark chocolate chunks to create a marbled effect.
Freeze the ice cream for at least 2 hours, or until firm.
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