Penny had but one goal this week: "I want to see Matthew crash and burn today," she said simply. And thanks to the Star Challenge advantage she earned after winning the Mentor Challenge, she was well on her way to realizing that goal. She had the privilege of assigning each of her competitors their allotted cooking times, and it came as no surprise to Matthew that she saddled him with the least amount of time to make his diner dish, just 30 quick minutes, while she enjoyed a full 45 minutes.

As Matthew was watching from the sidelines waiting for his time to start, he was quick to notice that the very person who sabotaged him was well on her way to making severe missteps in her own dish of liver and onions. "I look over at Penny's liver, and it is already a train wreck," he explained of Penny's prep work with a sly grin. "Liver has a very metallic flavor to it, and to get that iron flavor out, the first thing you have to do is soak it," he said, explaining a crucial process that she did not follow. "It's going to be so gross." And it turned out, Penny's finished liver did include that dreaded metallic taste, just as Matthew predicted — and the judges were indeed able to discern it.

Click the play button on the video above to watch what unfolded between Penny and Matthew, and see Penny's reaction to hearing the judges' feedback.

Tune in to the finale of Comeback Kitchen on Sunday at 8|7c, then catch the premiere of Food Network Star at 9|8c to find out which competitor earned the spot in the cast of Season 12.