Prepare this dessert ahead, but do not cut or garnish it. Cover it tightly and refrigerate it for up to a day. Store the nut topping at room temperature in a resealable food storage plastic bag or in a tightly covered container.
Use the back of a spoon to swirl the filling, or make grooves in it with fork tines.
For buffets, cut this dessert into smaller pieces so it's easy for guests to sample.