Chill the ice cream bowl for at least 24 hours or until solid. You should not hear any water sloshing around when you shake the bowl.
Combine the granulated sugar, brown sugar, heavy cream, and butter in a medium saucepan over medium heat.
Bring to a boil and let cook for 3-4 minutes, stirring often. Add the pecans and cook an additional 2-3 minutes, until the syrup thickens and coats the pecans.
Pour out onto a baking sheet and spread with a spatula. Let cool completely before breaking into small pieces. Reserve for later.
In a large bowl, combine the heavy cream, whole milk, granulated sugar, vanilla extract, and kosher salt. Whisk for 2-3 minutes, until the sugar is dissolved into the mixture. You should not feel any grit if you rub the mixture together between two fingers.
Churn the ice cream mixture in the bowl of your ice cream machine according to your manufacturer’s instructions (mine took about 25 minutes), until it is thick and the consistency of soft-serve ice cream.
In the last two minutes of the churn, add all but 2 tablespoons of the pralines, reserving those for later. Churn until evenly distributed.
Spoon the ice cream into a shallow container or a loaf pan. Top with the caramel sauce and swirl with a spatula. Sprinkle with reserved pralines.
Press plastic wrap or wax paper to the surface of the ice cream. Freeze for at least 4 hours, or until solid. Let sit at room temperature for about 5 minutes before serving.