Add whipping cream to the bowl of electric mixer and whip just until thickened. Add sugar and 3 to 4 tablespoons limoncello. Continue whipping until stiff peaks form.
Whisk together lemon curd and remaining 3 to 4 tablespoons limoncello until well combined.
In a shallow glass casserole dish spread the prepared whipped cream mixture. Add dollops of the lemon curd randomly on top and using a knife, gently swirl it into the whipped cream.
Freeze for at lest 4 hours, or overnight.
Scoop into chilled cocktail glasses and garnish with a frozen lemon slice. For extra pucker pour a splash of limoncello over top!