Technically, yes, it’s perfectly safe to eat. Nutritionally, you’re getting all the fiber and a bit of the original vitamins (though some degrade during the process). But let’s be honest: it’s not going to replace your morning salad.
The real value here is in curiosity. You’re not freeze-drying lettuce because you need to; you’re doing it because you want to see what happens. And that’s a perfectly good reason to try anything in the kitchen.
So go ahead, toss that leftover lettuce into the freeze dryer. You might not end up with a delicious snack, but you’ll definitely have a story to tell and a very weird, very crispy leaf to show for it. Isn’t that what cooking (and science) is all about?
