Butterscotch with bourbon

6 large eggs 1 1/2 cups dark brown sugar , firmly packed 1 teaspoon pure vanilla extract 1/4 teaspoon salt 1 1/2 lbs unsalted butter , cold 2 tablespoons[...]

4 tablespoons butter 1 cup firmly packed dark brown sugar 1 cup heavy cream 2 cups whole milk 3/4 teaspoon salt 3 tablespoons cornstarch 2 large eggs 2[...]