So you thought preserved lemons sounded like a cool ingredient and you got yourself a jar! …Now what? There are only so many Moroccan chicken tagines a person can make, after all. Here are a few ideas for using up that whole jar.First of all, know that preserved lemons will keep for quite a while in the fridge. They are preserved, after all. Kept refrigerated, these lemons will keep for about a year, so don’t feel that you have to rush to use them up before they go bad.