In a food processor, pulse together all base ingredients until it reaches a dough-like consistency.
Press dough-like base into bottom of parchment paper-covered loaf tin and freeze for 10 minutes while you make the filling.
In same food processor, pulse together all filling ingredients. Pour filling over the top of the chilled base and freeze once more for about 1-2 hours, or until firm.
Once firm, remove from loaf tin, place on cutting board and use a knife to cut into rectangles (or desired shape/size).