- 60 sponge-cake-type ladyfingers (from three 3-ounce packages)
- 2 3/4 cups chilled whipping cream
- 4 ounces unsweetened chocolate, chopped
- 1/4 cup sugar
- 1 cup plus 2 tablespoons powdered sugar
- 1/2 cup unsalted butter, room temperature
- 2 teaspoons vanilla extract
- 1 teaspoon ground cinnamon
- 1 ounce semisweet chocolate, grated
- Line bottom of 9-inch-diameter springform pan with ladyfingers. Line sides of pan with ladyfingers, standing ladyfingers side by side and rounded side out. Stir 3/4 cup whipping cream, unsweetened chocolate and 1/4 cup sugar in heavy small saucepan over low heat until chocolate melts and mixture is smooth. Remove saucepan from heat and cool to room temperature.
- Using electric mixer, beat 1 cup powdered sugar, butter and 1 teaspoon vanilla in large bowl until blended. Beat in cooled chocolate mixture. Combine remaining 2 cups cream, 2 tablespoons powdered sugar, 1 teaspoon vanilla and cinnamon in another large bowl. Using clean dry beaters, beat until firm peaks form. Fold half of whipped cream mixture into chocolate mixture.
- Spread half of chocolate filling in ladyfinger-lined pan. Top with layer of ladyfingers, then remaining chocolate filling. Pipe or spread remaining whipped cream mixture over filling. Sprinkle with grated semisweet chocolate. Refrigerate until firm, at least 3 hours. (Can be made 1 day ahead. Cover and keep refrigerated.) Remove pan sides from cake and serve.