I would just like to issue a public health warning. Do not add preserved lemons to a spicy casserole that you have slaved to prepare. Far from giving it a taste of Morocco, it will add a whopping great big taste of Flash or any other kitchen cleaner that has a vaguely lemony smell. Possibly the most disgusting meal I have ever made - which was a shame as it tasted marvellous until they went in.
Hmm. I've never used bought ones. It's really easy to preserve them yourself, and they taste really nice. You just cut them and get loads of salt and pour over the salt and leave them for about 3 or 4 weeks and then they're ready. But you have to rinse them out thoroughly, and throw away the pulp and just use the remaining peel. How do the Waitrose ones come?