Compared to narezushi"s millennia-old history, the sushi we eat today is a mere footnote. Technically called hayazushi (fast sushi), it was created in Edo (modern-day Tokyo) in the late 18th Century as a fast-food version of narezushi to meet the needs of the city"s busy people. The newly bottled seasonings of fermented rice vinegar and soy sauce were used to recreate the essential sour, salty and rich taste of funazushi in the fresh seafood that was caught in Tokyo Bay. First, rice vinegar was added to cooked rice to speed up the fermentation process to just a few days. This practice also made the rice more edible. Later, freshly cooked rice was simply soaked with rice vinegar.