May one Prepare Sushi on Shabbos?

May I Make Sushi on Shabbos?

Making sushi on Shabbos can potentially violate any of the following five melachos (forbidden acts on Shabbos):

Mevashel (cooking): Hot rice might cook the raw fish and vegetables; however, sushi is generally made with rice that has cooled off, eliminating this problem.

Tochen (grinding): Cutting the vegetables very thinly would violate this melachah; however, this problem can be avoided by preparing the vegetables before Shabbos.

Boneh (constructing): Although one is generally permitted to put various ingredients together to create a dish on Shabbos, making sushi involves forming it into a particular shape—usually used for decorative purposes—an act that is included in Boneh and therefore forbidden.

Makeh B’patish (putting the final touch to something): According to a minority view, this applies to ochlin (foodstuffs) as well, and making sushi would therefore be a violation of this melachah

Tofer/Medabek (sewing/attaching): According to some poskim, wetting the seaweed and attaching it to the rice may violate this melachah. #460

https://halacha2go.com?number=460

Practical Halacha: One minute a day. By Horav Yosef Yeshaya Braun, shlita, Mara D'asra and member of the Badatz of Crown Heights.