Hi, hopefully this is the right part of the forum for this kind of question. I just feel the need to know, love this kind of information when it comes to food and cooking. I'm not very good at Sushi, I've only tried making it once. However, my mum made Sushi this weekend with some friend and she mention they just boil the rise and sliced the salmon raw with no preps. So I'm wondering, don't you usually put vinegar in the rice? Isn't that to prevent health hazards as the vinegar cooks the salmon to some degree?