9 inch graham cracker pie crust
4 egg yolks
1/2 cup key lime juice
1 14 oz can sweetened condensed milk
4 tsp lime rind
1 1/2 cups whipping cream
1 1/2 tbsp sugar
1/2 tsp. vanilla
1 1/2 tsp. dark rum (optional)
Whisk egg yolks until blended; whisk in lime juice. Add milk, whisking until blended. Stir in lime rind. Pour into pie crust and bake at 350* for 12-15 minutes or until set. Remove from oven and cool on wire rack. Cover and chill 8 hours.
Beat cream until foamy, gradually add sugar, beating until soft peaks form. Gently stir in vanilla and, if desired, rum. Spoon on top of pie.