To make authentic sushi, find sushi seasoning. Essentially sushi seasoning is a sweet vinegar mixed into the rice while warm. The most likely places to find the seasoning will be where you saw the sushi rice. However, you can make a version of it yourself. Mix granulated sugar and salt in with the vinegar and stir to dissolve. The amounts of sugar and salt are down to personal preference but as a rough guide two tablespoons of sugar and two teaspoons of salt with ½ a cup of rice vinegar. Alternatively, try a cider vinegar which works well with sushi rice.
Make ½ a cup of sushi seasoning for every 3 cups of uncooked sushi rice. Once cooked, this rice will expand a lot and will quickly make enough sushi for a banquet.
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