FILLING: Soften gelatin in cold water 5 minutes. Heat chips and coffee in double boiler until melted, stirring constantly. Remove from heat, add gelatin, stir until dissolved. Beat egg yolks well. Add yolks, 1/4 C of the sugar, salt and vanilla to chocolate. Beat egg whites till foamy. Gradually add remaining 1/4 c sugar and beat till stiff. Fold into chocolate mixture, pile lightly into shell. Chill until firm, top with Whipped Cream. Freezes well and tastes great