Jenn: "I'm calling these my boomerang biscuit bars. I have a sister who lives in Australia, and so these are Australian flavors."

Voice-over: "A macadamia shortbread will serve as the base for Jen's boomerang bars. That will get a punch of umami from an unexpected Aussie flavor in her caramel. She's using Vegemite!"

Paul Hollywood: "Vegemite?"

Jenn: "Yeah. It's like yeast extract."

Paul Hollywood: "Caramel yeast extract?" 

Jenn: "Yes."

Paul Hollywood: "Why did you come up with this?"

Jenn: "Somebody's got to be the innovator and do something nobody's ever done before."