Wrap each disc in plastic wrap, stack the discs on a plate, and refrigerate until stiff enough to work easily, at least 2 hours. Meanwhile, make the filling(s). For the poppy, raspberry and/or ...
Put the lettuce leaves on a large plate. Set all the fillings out on the table and let people assemble their own lettuce wraps. If you have veg boxes delivered or have a good veg grocer ...