Frozen Lemon Cake
["3 eggs", "1/2 c. sugar", "1 c. heavy cream or 3/4 c. chilled condensed milk", "2/3 c. vanilla wafer crumbs", "juice and rind of 1 lemon"]
["Mix egg yolks, sugar, lemon juice and lemon rind.", "Cook over hot water, stirring constantly, until thick as cream.", "Cool. Gently mix in stiffly beaten egg whites and whipped cream.", "Use crumbs for top and bottom."]
["eggs", "sugar", "heavy cream", "vanilla wafer crumbs", "lemon"]