Preheat the oven to 350?F (175?C). In a mixing bowl, combine pretzel crumbs, melted butter, and brown sugar until well mixed.

Press the mixture into the bottom of a 9-inch pie dish. Bake for 10 minutes, then let cool.

In a mixing bowl, whisk together heavy cream, whole milk, granulated sugar, and vanilla extract until the sugar is dissolved.

Stir in the pureed strawberries until well combined.

Pour the ice cream mixture into an ice cream maker and churn according to the manufacturer's instructions until it reaches a soft-serve consistency.

Spoon the churned ice cream into the prepared pretzel crust, smoothing the top. Cover with plastic wrap and freeze for at least 4 hours or until firm.