Unusually, you supply your own ingredients for this one — they send a suggestion list and you pickle whatever you actually have, which is the entire point since it's built around using up kitchen scraps. Worth knowing at booking because it needs a bit of preparation from participants rather than a box arriving. What you learn is a brine ratio you can apply to anything, and that carrot tops and radish leaves are worth keeping. My fridge has been noticeably less wasteful since.
Nina