totally terrific tiramisu

another version of tiramisu...i love both of the version..this one taken from At Home Cafe book...

2 oz dark chocolate, grated
1 cup mascarpone
8 oz cream cheese, softened
2 cups sour cream
1/2 cup sugar
1 1/2 cup brewed coffee
20 sponge fingers

• combine mascarpone, cream cheese, sour cream and sugar in a large bowl and whisk until smooth and thoroughly combined
• pour coffee into a shallow dish. dip each sponge fingers lightly into coffee
• place sponge fingers at the bottom of a 20quart glass dish
• cover them with a layer of cheese mixture and sprinkle with little grated chocolate
• repeat layers, finishing with cheese mixture. sprinkle the remaining chocolate and chill in the refrigerator for 2-3 hours before serving