How to Make It
Shave the browned top, bottom and sides from the pound cake and discard the shavings. Cut the cake horizontally into 4 even slices.
Push the ricotta through a sieve into a large bowl. Sift the confectioners" sugar over the cheese and beat it in along with 2 tablespoons of the orange liqueur and the vanilla. Fold in the chopped chocolate, candied orange peel and walnuts.
In a small saucepan, heat the water with the granulated sugar until the sugar dissolves. Remove from the heat and stir in the remaining 1/4 cup of orange liqueur. Line a 10-by-6-inch loaf pan with plastic wrap, allowing 6 inches of overhang all around. Brush 1 side of 1 cake slice with the orange syrup and set it, dry side down, in the pan. Spread one-third of the ricotta filling over the cake in the pan. Brush both sides of a second cake slice with orange syrup and set it in the pan. Cover with another third of the ricotta filling, another brushed cake slice and the remaining ricotta. Brush the last cake slice only on 1 side and set it on the ricotta, dry side up. Cover with the plastic wrap and refrigerate for at least 1 hour.
Invert the cake onto a platter and discard the plastic. Sift the cocoa on top. Cut the cake into 1-inch slices and serve.