Sushi rice is not just plain steamed rice. It may look like it, but it’s actually seasoned with vinegar. In fact, master sushi chefs, such as Jiro Sukiyabashi, who served President Obama, use two or three different versions of sushi rice each day. Sometimes their sushi rice is pure white and sometimes it has a reddish tone, depending on the vinegar used for seasoning. Chefs use different vinegars for different fish, just as you might use robustly flavored olive oil for cert