In a bowl, combine the lemon zest, lemon juice, wine, brandy, and sugar. Stir until the sugar is dissolved. Cover and refrigerate overnight to allow the flavors to infuse.
Chill six Irish mugs. Stir the heavy whipping cream into the lemon juice mixture. With an electric mixer, beat until soft peaks form.
Spoon into mugs and refrigerate up to 4 hours or until set.
Garnish with mint leaves and lemon zest (optional).