To a saucepan over medium heat, add in butter, chopped pecans, brown sugar, vanilla and salt. Allow the sauce to thicken. Once it becomes a syrupy consistency pour 1/4 of the sweetened condensed milk. Mix together. Everything should start to merge into a uniform syrup resembling caramel. Set aside to cool
For the Ice cream
Line a 9x5 pan with parchment paper. Using an electric mixer or stand mixer, whip heavy cream in a large bowl until stiff peaks form (about 3 minutes) Stir in sweetened condensed milk, vanilla and salt until well combined. Fold in the chopped pecans
To the loaf pan, Add 1/2 of the whipped cream mixture into a prepped freezer safe pan. Add a few spoonfuls of the syrupy buttered pecans. Use a knife or spatula to fold throughout the pan. Add the remaining heavy cream mixture on top. And repeat with a few more spoonfuls of the syrupy pecans. Swirl again and top with remaining chopped pecans.
Cover with plastic wrap and foil. Allow to freeze for at least 8 hours. Serve in a bowl or in a waffle cone and enjoy!