If he didn't think he was wasting food – regardless of what happened to everything that got thrown out, magic or whatever, the food wasn't able to be eaten – Emma didn't even know how to finish the thought. Probably he'd never worried about where food was coming from.

Maybe a different perspective. "You do know somebody is waiting to eat whatever it is he's trying to cook, right? Are you going to explain to them why your theories are more important than their hunger? He's just trying to do his job." Focusing on her roux made it easier not to be self-conscious about calling the guy out on being rude, but it was getting to the delicate point now, and she couldn't really afford to get distracted right now, but she'd started this, she wasn't quite ready to give it up.