[rfp1234]

Snail juice, extra shells.

[SpaceBar]

I'm sure adequately cooked river mollusks and gastropods provided a high quality and nutritious source of protein when the dish was first tried 15,000 years ago, but by their nature bioaccumulate toxins and carry parasites that need to be dealt with (cooking). In modern China where all manner of pollution is widespread, such things should probably be avoided.