In double boiler, melt 1 1/3 package chocolate chips, 2 tablespoons sugar, and 2 tablespoons water. Separate eggs. Remove chocolate mixture from stove; beat egg yolks and add to chocolate mixture. Cool until mixture is room temperature. Beat egg whites until stiff. Fold into chocolate mixture and refrigerate until thick.

Cut cake in half horizontally. Pinch out pieces of cake and put back into center. Spoon in chocolate mix and put cake halves together. Beat whipping cream, adding 1/3 cup sugar and vanilla. Frost whole cake and refrigerate. May be made a day ahead of time.