Make up a sandwich with a filling of your choice. Cut the sandwich into a neat rectangle.
Place the sandwich on top of the tortilla wrap, then use it as a guide to cut out a larger rectangle for the book cover. The length of the rectangle should be two and a half times as wide as the short side of the sandwich, and the width slightly longer than the long side of the sandwich.
Fold the tortilla rectangle around the sandwich to make the book cover. The tortilla should stay in place once folded, but if it needs sticking down you can use a little cream cheese, hummus, peanut butter or honey as edible 'glue' to hold it in place.
Draw on your book cover design using the edible food writer pen. I roughly copied the front cover of 'Quidditch Through the Ages' but you can use any book cover of your choosing.
Pack in a lunch box or arrange on a plate to serve.