" I was gazing at a cup of cocoa on my night table.

As I focused on the thick brown skin that had formed upon its surface like ice on a muddy pond something at the root of my tongue leapt like a little goat and my stomach turned over. There are not many things that I despise but chiefest among them is skin on milk. I loathe it with a passion.
Not even the thought of the marvelous chemical change that forms the stuff—the milk’s proteins churned and ripped apart by the heat of boiling then reassembling themselves as they cool into a jellied skin—was enough to console me. I would rather eat a cobweb. "

― Alan Bradley , A Red Herring Without Mustard (Flavia de Luce, #3)