Step 1:Line 14×10 inch cake pan with waxed paper and grease paper. Preheat oven to 350F.

Step 2:CAKE…. Melt chocolate in double boiler over low heat. In a large bowl, cream butter and half the sugar until light and fluffy. Add salt, cinnamon and lemon peel. Beat in egg yolks, one at a time, with melted chocolate.

Step 3:Beat egg whites until stiff; fold in remaining sugar. Fold egg white mixture into creamed mixture with flour. Spread batter evenly in prepared cake pan. Bake 20 minutes or until a wooden pick inserted in center comes out clean.

Step 4:Sprinkle a sheet of waxed paper with sugar and turn out cake onto it. Peel off lining paper. Cool 2 hours, then cut cooled cake lengthwise into two 14×5 strips.

Step 5:FROSTING… Melt butter, cool slightly. Finely grate chocolate. Mix chocolate, eggs, powdered sugar, butter and rum in double boiler. Stir constantly over low heat until chocolate has melted and all ingredients are thoroughly combined. Cool.

Step 6:Place the two 14×5 strips on top of one another, with about half of the frosting used as filling. Spread remaining frosting thickly over top. Cut into slices when frosting is firm.

Step 1:Position rack in center of oven and preheat to 350°F. Butter three 8-inch-diameter nonstick cake pans with 1 1/2-inch-high sides. Place devil\’s food cake mix, 1 cup water, 1/3 cup vegetable oil, eggs, vanilla extract and 1/4 cup sour cream in large bowl. Using electric mixer, beat batter 2 minutes. Stir in 1 cup semisweet chocolate chips.

Step 2:Divide batter among prepared pans (about 1 3/4 cups batter for each). Bake until tester inserted into center of cake layers comes out clean, about 25 minutes. Cool cake layers in pans on racks 15 minutes. Run small sharp knife between pan sides and cake layers to loosen. Turn out onto racks; cool completely. Bring 1/2 cup raspberry jam and 3 tablespoons unsalted butter to simmer in heavy large saucepan over medium heat, stirring often. Remove from heat. Add remaining 3 cups semisweet chocolate chips and stir until melted. Add remaining 3/4 cup sour cream and 2 cups powdered sugar. Using electric mixer, beat frosting in pan until smooth and thick, about 2 minutes.

Step 3:Place 1 cake layer on platter. Spread 3/4 cup frosting over. Top with second cake layer. Spread 3/4 cup frosting over. Top with third cake layer. Chill cake until frosting sets slightly, about 15 minutes. Spread remaining frosting in swirls over top and sides of cake. (Can be prepared 1 day ahead. Cover with cake dome and let stand at room temperature.)