Do not let the thought of prunes in your cake turn you off! The taste of the prunes are so mild, I would be surprised if you could even taste them at all. Though hidden, the prunes bring a world of difference to this cake. The cake is so unbelievably moist you have to taste it to believe it. I left a small piece of unfrosted cake standing defenseless on the counter for 6 hours and not a bit of the moisture had left it. If that doesn't convince you, I don't know what will.
Yields two 10-inch round cakes
12 ounces pitted prunes
3 cups weak brewed tea (optional)
2 cups all-purpose flour
3 tablespoons unsweetened cocoa powder
4 teaspoons baking powder
1/2 teaspoon baking soda
12 tablespoons (1 1/2 sticks) unsalted butter, softened
1 1/2 cups sugar
3 large eggs
1 cup milk
Butter and flour, or line the cake pans with parchment paper.
In a medium mixing bowl, combine flour, cocoa, baking powder, and baking soda. Stir well.
In a separate bowl, combine the prune puree with the milk.
Beat together the butter and sugar until light and fluffy. Beat in the eggs one at a time, beating well after each addition. Beat in a third of the dry ingredients, then mix in half of the prune puree. Scrape the bowl. Beat in another third of the dry ingredients, the rest of the prune puree, and the remaining dry ingredients.
Divide batter evenly between the prepared pans. Bake the cakes for 30 to 40 minutes, or until a toothpick inserted into the center of the cake emerges clean. Cool the cake layers in the pans for 10 minutes before placing them onto cooling racks.
Combine the cream, butter, sugar, and salt in a saucepan and bring to a simmer over low heat. Remove from heat and add the chocolate. Let stand for 5 minutes. Whisk in the espresso powder and vanilla.
Scrape the frosting into a bowl and chill it until it is of spreading consistency. Do not leave in the refrigerator or it will set very hard (if this happens, chop up hardened frosting into 8 to 10 pieces and stir in a bowl over warm water until it reaches a spreadable consistency).