Although British food has become a dark dish in the eyes of international students, Britain's national cuisine has at least made a huge contribution to office workers around the world, and that is sandwiches.

The sandwich originated in England. It is said that it was invented by an earl who was too obsessed with playing cards and had no time to eat.

British sandwich town.

/JoanaKruse, Alamy Stock In the 18th century, Sandwich was a small town in southeastern England. According to legend, there was an earl named John Montagu in the town.

He is addicted to card games every day, to the point where he forgets to eat and sleep, feeling that eating takes up his time to play cards.

He thought, he loves bread, meat and vegetables, why not eat these foods together?

So he ate the bread with meat and vegetables and found that it tasted really good. He recommended it to his poker friends who were playing cards with him.

Gradually, everyone started to eat this stuff while playing cards.

When this food spread out of the town, people called the food derived from Sandwich a sandwich.

Workers make sandwiches with their bare hands on the assembly line at the Greencore sandwich making factory in Worksop, Nottinghamshire, UK.

/panos pictures According to statistics, the UK eats 11.5 billion sandwiches every year, and the sandwich industry also brings 300,000 jobs to the UK.

In order to express their love for sandwiches, the British have also established a festival called "British Sandwich Week", which takes a full week to celebrate their favorite food.

"Sandwich Research Laboratory" writer Yui Nagata is very fond of sandwiches. He studies sandwiches with Japanese sincerity and rigor. He lists various data, charts, and formula analysis, and studies the infinite combination possibilities of this common food with a craftsman's spirit.

In the book, he introduced seven countries, two regions, 25 menus, 143 recipes, and launched a set of universal "sandwich formulas."