A chef poses with the 'Golden Giant Burger' at the Grand Hyatt Tokyo restaurant in Japan on April 1, 2019. Weighting 3kilograms, the special giant burger costs about 100 yen ($920.5). Photo: IC

A Bangkok burger joint has become an internet sensation after YouTubers started challenging each other to eat its biggest meal, a near six-kilogram patty covered in fried onion rings, bacon and mayonnaise.

Chris Steaks and Burgers is offering a 10,000 baht ($330) prize for anyone who can finish the mammoth snack in nine minutes - one baht for every calorie.

Owner Komdech Kongsuwan, who says it is the country's biggest burger, dreamed up the contest after three customers managed the feat. New challengers are coming through the door every day.

Among them was Pakorn Porncheewangkoon, who failed to finish the burger in time. 

"I will eat a burger at some point (in the future), but not any time soon," Porncheewangkoon said.

The beef version of the "6kg Burger" costs 2,500 baht ($82.75) and the pork one costs 3,500 baht ($115.86).