I’ve heard a claim that making sushi on Shabbos is a problem of Boneh, is that the generally accepted opinion?
Am I correct, that if I’m not making it with any specific design or shape I’m just squeezing the contents together to make them in a general sushi roll form, would that be subject to Boneh?
Thank you for your question.
The design is not the issue of boneh rather the pressing the ingfredients together even if it is merely in a general form, (you do want it flat so that you can roll it). Please see the attached article עומק הפשט 292 ויגש תשפ”א – הכנת סושי בשבת that discusses the various issues with making sushi on Shabbos.