I’ve been wondering about lemon peels themselves. I love lemon rind, a handful tossed in with a salad, or with a mixed drink, or an antipasto.
Not sure how much they would dry out, or how long they might last, or how exactly to re-constitute them, but might work!
http://www.dehydrate2store.com/videos/?id=29 for lemons and lemonaide
http://www.dehydrate2store.com/videos/?id=19 orange rinds
Between these two, you’ll get the idea. No reason why you can’t dehydrate lemon rinds. :o)