Make a simple syrup by combining the raw sugar and water in a saucepan and cooking over low heat until the sugar is dissolved. Remove from the heat and let cool.
Next, drain the water from the canned chestnuts. Place in a food processor and puree. Add the simple syrup and Grand Marnier, to taste, while blending (chef's tip: make it a bit sweeter then you like). Lay the torn chunks of pound cake in the bottom of 4 serving glasses. Add 2 tablespoons of Marsala to each and then some chestnut puree on top of the poundcake. Refrigerate for 1 hour.
After removing it from the refrigerator, add layers of the whipped cream and caramel sauce. Top with blackberries and walnuts before serving.
Professional Recipe: This recipe was provided by a chef, restaurant or culinary professional and makes a large quantity. The Food Network Kitchens chefs have not tested this recipe in the proportions indicated and therefore cannot make any representation as to the results.
Copyright 2003, Daisuke Utagawa, All Rights Reserved
Recipe courtesy of Mario Batali