Don't remember where this came from...but it's a great special occasion dessert. Tastes just like a white russian, only not in liquid form. And it's much easier than you'd expect. Cooking time does not include chilling time.
For crust: Combine first 3 ingredients in 9-inch springform pan; press into bottom and up sides. Refrigerate until firm.
For filling: Sprinkle gelatin over water in small bowl. Set in pan of simmering water and stir until dissolved. Whisk yolks and 4 tablespoons sugar in large bowl until thickened and light. Gradually whisk in dissolved gelatin. Blend in 1/2 cup plus 1 tablespoon Kahlua and vodka. Set in larger bowl filled with ice and stir until mixture thickens, about 5 minutes.
Beat egg whites to soft peaks. Gradually add remaining 3 tablespoons sugar and beat until stiff and shiny. Fold into gelatin mixture. Beat 1/2 cup cream to stiff peaks. Fold into gelatin mixture. Turn filling into crust. Refrigerate pie at least 3 hours or overnight.
For topping: Beat 1 cup whipping cream to soft peaks. Add 3 tablespoons Kahlua and 2 tablespoons sugar and beat to stiff peaks. Swirl topping over pie. Garnish with chocolate curls, if desired. Serve chilled.