So at first glance a casual reader wouldn’t even give this passage a second glance. However, I’m going to tell you exactly why I’m pissed off, and why you should be too!
First off, Jace and Clary just found out that Dorothea is either a possible supernatural with unknown loyalties (and mind you this is just after being attacked by another of Valentine’s minions). So what do they do? They first of all have a discussion about Shadowhunters and magic (which I will be most diffidently talking about later) and then they eat the possible supernatural threat’s food like complete dumbasses! And yeah, it’s revealed that later on that Dorothea is a mundane with some supernatural connections.
However, it doesn’t take away from the very good point that Dorothea could have easily poisoned them both and probably gotten away with it with the dimensional door right that was right there in her parlor. And does Jace, the smart, the ever the world-weary Shadowhunter tell Clary not to eat the food, or even try to taste for poison? Nope! Oh, Jace tastes the food alright, but it was pretty much inferred in the context of the passage that the only reason Jace didn’t eat the entire sandwich himself, was because he hated the cucumbers in it. I swear to fucking god, no one in this goddamn book has a lick of common sense! It’s so fucking aggravating!