It's not his fault she doesn't believe him. Her mind is wired not to take pretty much anyone at their word.

"...I'm afraid I don't," she answers after a moment, that eyebrow still high on her forehead. "I could ask around, though, if you'd like."

She's good at finding information and she gets the impression that the Nexus is one of the few places where she might actually find a recipe for preparing a lizard.