This is a rich, candy-like dessert. A small piece goes a long, delicious way. For a more intricate icing, drizzle melted red currant jelly in straight lines over the icing. Pull the point of a knife through the lines to make a pretty design.
Use about 8oz of shortbread cookies and process in a food processor to make crumbs. Make the slices up to three days ahead of time.
