Sushi and its unique cultural origin and evolution
I. The Origin of Sushi: Not Originating from the "Fermentation Wisdom" of Japan
When it comes to sushi, many people would first think of it as a traditional Japanese cuisine. In fact, the original form of sushi can be traced back to thousands of years ago in Southeast Asia. At that time, people invented a unique food processing method to better preserve fish in the hot climate - they mixed fish with cooked rice and used the lactic acid produced by the fermentation of the rice to inhibit bacterial growth, thereby extending the shelf life of the fish. This early form of "sushi" was more like a fermented food, and had a world of difference in taste and appearance from the sushi we eat today.
Later, this food preservation technique spread to China along with trade and population migration. In ancient Chinese literature, there were records of "zhǎ" (a type of fermented food), which was the early name for sushi in China. At that time, "zhǎ" was usually made by mixing fish, meat, etc. with rice, salt, and spices, and sealing it in a container for fermentation. It was a common way of preserving food among the common people. For example, in the "Qi Min Yao Shu" from the Northern Wei Dynasty, detailed methods for making "fish zhǎ" were recorded. From the selection of ingredients, processing, to the control of fermentation time and temperature, there were strict requirements, which fully demonstrated the wisdom of ancient people in food preparation.
Around the 7th century AD, this fermentation method for preserving fish was introduced to Japan. Initially, the Japanese people continued to use rice fermentation to preserve fish meat. They called this food "shūsushi" (cooked sushi). However, at that time, "shūsushi" was mainly for preserving fish meat, and the rice was usually discarded after fermentation, only the fish meat was eaten. Moreover, this sushi was made with a long production cycle, often taking several months or even half a year, so only the nobility and the wealthy could occasionally enjoy it, and ordinary people had little access to it.
Over time, Japanese people continuously improved the method of making sushi. During the Edo period (1603-1868), the social economy gradually flourished, and the urban population increased. The food culture also experienced rapid development. Against this backdrop, the production process of sushi underwent significant changes, evolving into the form we are familiar with today.
II. The Transformation in the Edo Period: The Birth of "Edo Front Sushi"
Edo (now Tokyo) is located along the Tokyo Bay, with abundant fishery resources, which provided favorable conditions for the development of sushi. At that time, some fishermen began to try to shorten the production time of sushi. They discovered that by placing fresh raw fish slices on vinegar-seasoned rice, without the need for long fermentation, they could make delicious food. This method not only significantly shortened the production cycle of sushi but also maximally retained the fresh taste of the fish meat, quickly gaining popularity among the people.
This new type of sushi was called "Edo Front Sushi", marking the official transition of sushi from a food preservation method to a food that pursues fresh taste. "Edo Front Sushi" was very meticulous in its production, with extremely high requirements for the freshness of ingredients, the taste of rice, and the proportion of vinegar.
Firstly, the selection of ingredients. "Edo Front Sushi" used mostly fish from the Tokyo Bay. Fishermen went out to sea every morning to catch fish and delivered the freshest catches to the market. The sushi master would select the most suitable fish for making sushi based on the day's catch, such as tuna, salmon, shrimp, scallops, etc. Moreover, different types of fish had different processing methods, such as tuna, which needed to be cut according to different parts (red flesh, medium fat, large fat) to ensure the best taste of each piece of raw fish slice; Shrimp needs to have the shrimp lines removed and the shrimp yolks retained to make the sushi more delicious.
Secondly, the rice preparation. The rice for "Edogawa-style sushi" is called "vinegared rice". It is made by cooking high-quality rice and then adding an appropriate amount of vinegar, sugar, and salt to blend. The steaming of the rice is very crucial. The amount of water and the heat need to be controlled properly to make the rice distinct in texture, soft but not sticky. The vinegar mixture also requires careful preparation. Different sushi chefs have their own unique recipes. Some may add a small amount of kelp broth to give the vinegar rice a faintly sweet flavor; others will adjust the ratios of vinegar, sugar, and salt according to the changes in the seasons to suit the taste of different seasonal ingredients.
Finally, the techniques for making sushi. The production process of "Edogawa-style sushi" requires the chef's hands-on skills. The chef needs to shape the vinegar rice by hand and then place the raw fish slices on top. Some may also apply a small amount of wasabi between the raw fish slices and the vinegar rice to enhance the taste. The force used to shape the sushi is also important. Using too much force can easily crush the rice and affect the taste; using too little force can make the sushi loose and inconvenient to eat. An experienced sushi chef can complete the production of a sushi in just a few seconds, and each sushi is almost the same in size and shape, making it an art form.
In the Edo period, "Edogawa-style sushi" mainly appeared in the form of mobile vendors. These vendors usually pushed a small cart, with the ingredients, tools, and vinegar rice needed for making sushi placed on it, selling on the streets and alleys. As night fell, these sushi vendors would light lanterns to attract passers-by. People gathered around the cart, watching the chef skillfully making sushi, and then tasted it while it was hot. This lively scene became a unique landscape on the streets of Edo at that time.
As "Edogawa-style sushi" became more popular, some sushi vendors gradually settled down and opened dedicated sushi restaurants. These sushi restaurants are mostly simple in decoration, with seats usually arranged around the sushi counter. Diners can watch the chef making sushi closely and communicate with the chef to adjust the production according to their own taste. This dining method not only increases interaction between diners and chefs but also allows diners to more intuitively experience the charm of sushi production, continuing to this day.
