Preheat oven to 180°C. Grease a 13 x 9 x 2-inch baking tin.
Melt unsweetened chocolate and butter in saucepan on low heat until the butter is melted. Stir until the chocolate melts. Stir in 1 1/2 cups of sugar. Remove from heat.
Whisk in eggs and vanilla. Add flour, chocolate chips and nuts. Stir well. Spread into prepared tin.
To prepare POM Wonderful syrup, combine juice and 3/4 cup of sugar in a small saucepan; bring to the boil. Reduce heat and simmer about 20 minutes until reduced to 1/2 cup, stirring frequently.
Drizzle 1/4 cup of the POM syrup over batter, swirl with a table knife to create a marble-like effect.
Bake for 25 minutes, or until the top is firm. Do not overbake.
Cool in tin for 15 minutes. Drizzle remaining 1/4 cup POM Wonderful syrup over brownies. Transfer to a wire rack and cool for at least 1 hour.
Prepare garnish: Score 1 fresh pomegranate and place in a bowl of water. Break open the pomegranate underwater to free the arils. The arils will sink to the bottom of the bowl and the membrane will float to the top. Sieve and put the arils in a separate bowl. Reserve 1/4 cup of the arils from the fruit and set aside. (Refrigerate or freeze remaining arils for other uses.)
Whip the cream. Garnish the brownies with fresh arils and cream.