BTS rapper Suga used to blend together chicken breasts, bananas, and grape juice and drink it straight in his trainee years, according to bandmate Jin

• BTS' Suga apparently used to eat blended chicken breast, banana, and grape juice shakes as a trainee. 
• Jin, the group's eldest member, recounted the concoction in the group's recent memoir. 
• Jin said that he began to cook for the group and helped organize a chore schedule for their dorm.

Back in BTS' trainee days, Suga couldn't be bothered to eat a chicken breast on its own — instead, he'd blend it up into a terrifying concoction of chicken, bananas, and grape juice, according to his bandmate Jin. 

The seven members of BTS reflected on their early days as a group in the new memoir "Beyond the Story: 10-year record of BTS," written by journalist Myeongseok Kang and the group. But before BTS became one of the biggest musical acts in the world, they were seven teenagers living together in a dorm. According the group's memoir, that turned out about how you would expect. 

The group's eldest member Jin, whose given name is Kim Seok-jin, moved into the dorm in the summer of 2012 approximately a year before the group's 2013 debut. In "Beyond the Story," he says that conditions weren't ideal — especially when it came to food, and especially when it came to one of the group's rappers, Suga (Min Yoon-gi). 

"Suga would basically just 'eat to live,'" Jin said in the book. "He ate chicken breasts for protein but even eating them was too much of a hassle for him so he would blend it with some grape juice and a banana and gulp that down straight from the blender.

"I had a taste of it and thought, 'Nope, this isn't it,' and cooked up some things that I sprinkled with hot sauce or steak sauce," he continued. 

Jin's cooking aptitude and love of food has been well-documented over the group's career, from his mukbang series "Eat Jin" to his cooking posts on BTS' blog. When he entered the dorms, he said, he also began to cook for the other members — and in addition, help them to clean up scattered food, clothes, and dirty dishes through organizing a chore schedule. Eventually, though, he came to understand the mess when the group was pulling 14-hour rehearsal days. 

"After about three months there... I finally realized why they had come to live the way they did," Jin said. 

"Beyond the Story: 10-year record of BTS" is available now.