PREHEAT oven to 425° F.
COMBINE walnuts and brown sugar in small bowl. Place 3/4 cup nut-sugar mixture on bottom of pie shell. Combine pumpkin, evaporated milk, granulated sugar, eggs, pumpkin pie spice and salt in medium bowl; mix well. Pour into pie shell.
BAKE for 15 minutes. Reduce temperature to 350° F.; bake for 40 to 50 minutes or until knife inserted near center comes out clean. Cool on wire rack.
COMBINE butter and remaining nut-sugar mixture; stir until moistened. Sprinkle over cooled pie. Broil about 5 inches from heat for 2 to 3 minutes or until bubbly. Cool before serving.