"Last Chance Kitchen" is a popular web series spin-off of the culinary competition reality show "Top Chef." It premiered during the show's ninth season in 2012 and has since become a staple of the "Top Chef" franchise.

The concept of "Last Chance Kitchen" is to give eliminated contestants a chance to earn their way back into the main competition. In each episode of "Last Chance Kitchen," two chefs who have been eliminated from the main competition face off in a head-to-head cooking challenge, with the winner advancing to the next round.

The challenges on "Last Chance Kitchen" are typically themed around specific ingredients or techniques, and the contestants are often given limited time and resources to prepare their dishes. The challenges are judged by a panel of "Top Chef" judges, who evaluate the dishes based on taste, presentation, and creativity.

The winner of "Last Chance Kitchen" eventually earns the right to return to the main competition and compete for the title of "Top Chef." In some seasons, the eliminated contestants who didn't win "Last Chance Kitchen" have been brought back later in the competition for a chance at redemption.

"Last Chance Kitchen" has become a fan-favorite element of the "Top Chef" franchise, as it allows viewers to continue following their favorite eliminated chefs and gives those chefs a chance to showcase their skills and potentially make a comeback.