1 c. brown sugar
1/4 c. cornstarch
1/2 tsp. salt
1 c. water
1 2/3 c. milk
1/3 c. butter
3 egg yolks, slightly beaten
1 1/2 tsp. vanilla
9" baked pie shell

Mix brown sugar, cornstarch and salt in saucepan. Gradually stir in water and milk. Add butter. Cook over medium heat, stirring constantly, until mixture thickens and boils. Boil 1 minute. Remove from heat. Gradually stir at least half of hot mixture into egg yolks. Then blend into hot mixture in saucepan. Boil 1 minute more, stirring constantly. Remove from heat. Blend in vanilla. Pour into pie shell. Chill for at least 2 hours and top with Cool Whip when served.