8 tablespoons (1 stick) butter
1 cup packed dark brown sugar
3 tablespoons milk
1/2 tsp vanilla
1/4 cup chopped walnuts/pecans
Melt butter in a medium, heavy-bottomed saucepan over medium heat. Add sugar and whisk until sugar melts and mixture begins to boil, about 5 minutes. Stir in milk, vanilla, and pecans until smooth. Set aside