The longer the lamb marinates in the seasoning paste, the better flavor you'll have. Anywhere from 1 to 24 hours will work, but overnight is best. Slice the leftovers for pita stuffed sandwiches topped with tabbouleh.From the book "Mad Hungry," by Lucinda Scala Quinn (Artisan Books).
The lamb needs to marinate overnight, so prepare it the day before. Preserved lemons have been stored in jars of lemon juice and salt for at least a month. They have a silkier texture and a less sour flavor than regular lemons.