Munch's Burger Shack, an American burger restaurant located in Tokyo, served its signature Colby Jack Cheeseburger during Trump and Prime Minister Shinzo Abe's casual, business lunch on Sunday.
Abe tweeted out a picture of the two of them getting set to chow down, the ketchup graciously within Trump's arm reach.
"I welcome President Donald J. Trump most wholeheartedly on his visit to Japan! We're getting down to business right away over hamburgers for our working lunch."
According to the Fuji News Network, Yutaka Yanagisawa, the owner chef of Munch's Burger Shack, was "unbelievably surprised" when he was asked to serve his burger.
Trump reportedly enjoyed the 1,200 yen ($10.50) burger, which uses high-quality US Angus beef for its patty.
"At the end of their meal, I was able to introduce myself and shake hands," Yanagisawa said. "I was also able to shake his hand. He told me [that the burger was] 'very good.'"
In an interview with the Yomiuri Shimbun, Yanagisawa said that Trump and Abe were smiling after their meal.
"I want them to create a world where people can eat delicious things whenever they want."
Since then, people have been lining up at Munch's Burger Shack to get a taste of the burger that Trump ate.
According to Nikkan Sports, the main restaurant was closed on Monday, but its branch in Toranomon was totally sold out of burgers by 2:20 p.m.
Some people are referring to this phenomenon as a "Trump effect" — people are lining up not just at Munch's Burger Shack, but at other restaurants that serve cheeseburgers.
"There's a long line at the Trump's burger today as well."
BuzzFeed News tried to multiple times to reach Munch's Burger Shack by phone — but the lines were busy each time.