Chapotraphouse

Yes? I read it too.

the froth from the top of a fermenting vat of beer

If this was Korean or japanese you'd be saying it sounded interesting or delicious.

the liquid, or “wet,” off the top of a batch of mushy peas

As I said, it sounds nasty because you're preempted to think of it nastylike. It's just cooking, you can make it sound disgusting if you try. You could reward that description to use words like "slow-cooked" and I dunno. Its just the wording. Slap a Japanese guy on there talking about his traditional local white-green-rice and youd be calling it a delicacy.

I don't even particularly like British cooking, but this childish yank tendency of calling food gross in order to perform something is just tiring.
Deep fried potato slice in a bread roll with some wet stuff so its not too dry? Wow so nasty ewwwww. What's next, putting chocolate in their sauces? Those things don't mix!