History and recipes adapted from:
http://www.sushi-master.com/usa/whatis/history.html
http://japanesefood.about.com/od/sushiroll/r/tunatekkaroll.htm
http://www.ginmiyahouse.net/sitebuildercontent/sitebuilderpictures/tuna_sushi_0123.jpg
http://paulbuckley14059.files.wordpress.com/2007/05/sushi-for-2.jpg