Dreamy Chocolate Mousse Cake

I made this cake for Pat Winslow on her birthday and its very chocolate, 3 layers, I especially liked the chocolate mousse filling.  

Dreamy Chocolate Mousse Cake
paula Deen Chocolate Celebration

2 cups flour
2 cups sugar
3/4 cups cocoa powder
1 1/2 tsp baking powder
1 1/2 tsp baking soda
3/4 tsp salt
1 cup milk
1 cup strong brewed coffee
3/4 cups oil
2 large eggs
Preheat oven to 350 degrees. Grease and flour 3 (9) inch round or square cake pans. In a large bowl, combine flour, sugar, cocoa, baking powder and soda and salt. add milk, coffee, oil and eggs. Beat at medium speed until smooth. Pour evenly into prepared pans and bake for 23-25 minutes. or until toothpick comes out clean. Let cool in pans for 10 minutes. Remove from pans, and let cool completely on wire rack. Using a serrated knife, cut each cake in half horizontally to make 6 layers.

Dreamy Chocolate Mousse
1 envelope unflavored gelatin
3 Tbsp cold water
1/4 cup boiling water
1 cup sugar
1/2 cup unsweetened cocoa powder
3 cups heavy whipping cream
In a small bowl, soften gelatin in 3 tbsp cold water. let stand for 2 minutes. Add boiling water, stirring until gelatin dissolves. set aside. In a small bowl combine sugar and cocoa powder. In a medium bowl, beat cream at medium speed until foamy. Gradually add sugar mixture until, beating until stiff peaks form. Stir in gelatin mixture, Cover, and chill for 4 hours.

Chocolate Fudge Frosting
1 cup sugar
1 cup heavy whipping cream
5 (1 ounce) squares unsweetened chocolate
10 tbsp butter
1 cup confectioner's sugar
In medium saucepan, combine sugar and cream. Bring to a boil over medium-high heat, reduce heat, and simmer for 6 minutes. Stirring frequently and watch so it doesn't burn. Remove from heat, add chocolate and butter. Stirring until melted and smooth. Let cool for 10 minutes, Whisk in confectioner's sugar. Let mixture cool until it reaches spreadable consistency.
Place 1 layer, cut side up, on a cake plate, spread with one-fifth of Dreamy Chocolate Mousse. Repeat procedure with remaining cake layers and mousse. Freeze cake for 1 hour.
This frosting hardens very fast so do a section then garnish with the grated chocolate. Spread Chocolate Fudge Frosting evenly over the top and sides of cake. Garnish sides of cake with grated chocolate.