Hm, well the Beijinger has been running articles every few days about many of the restaurants in the burger cup. Look down below at the related articles and you’ll see some of them.
As for your last paragraph, the “Rock-Hard Buns” phrase is a dumb/silly phrase the Beijinger came up with to describe this year’s burger cup, and relates to rock n’ roll (this year’s theme), not the hardness/softness of buns. It’s pretty silly/dumb/confusing.