At which restaurant was ' Gunkan - maki ' created ?
" Gunkanmaki " ( , " warship roll " ) is a special type of " nigirizushi " : an oval , hand - formed clump of sushi rice that has a strip of " nori " wrapped around its perimeter to form a vessel that is filled with some soft , loose or fine - chopped ingredient that requires the confinement of " nori " such as roe , " nattō " , oysters , " uni " ( sea urchin roe ) , corn with mayonnaise , scallops , and quail eggs .