noun
sushi rolling mat; bamboo mat for rolling sushi
A thin mat made of bamboo sticks tied together, used to roll maki-zushi (rolled sushi). Also used in other food preparations like tamagoyaki.
巻きすの上に海苔を置いて、酢飯を広げてください。
Place the nori on the sushi mat and spread the vinegared rice over it.
巻きすを使うと、きれいな太巻きが作れます。
Using a sushi mat, you can make neat thick rolls.
Compound of 巻き (maki, 'rolling') + す (su, 'bamboo blind' or 'mat'). The す part is often written in hiragana, but kanji forms 簾 and 簀 exist, both referring to bamboo screens or mats.