Ferns are a thing in Korean cuisine, so you can find dehydrated ones at the Korean grocery store (they are brown when dried.) I used to hate them as a kid and always tried to pick them out of my bibimbap, but I appreciate them now.
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I had no idea that ferns were edible! Apparently, the sprouts of the Lady Fern have a nutty and slightly sweet flavor. I've been trying to find some to try, but it seems like it might be too late in the season for sprouts.