Why does a hard Hachiya ruin your lunch? It’s because of tannins. These are the same compounds in red wine that dry out your mouth. Persimmons have a ton of them.
When the fruit is unripe, the tannins are soluble. They dissolve in your saliva, and—bam!—your tongue feels like sandpaper. It’s a weird, shocking sensation.
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It’s not dangerous, just incredibly unpleasant. Think of it as the fruit yelling, “I’m not ready yet!” Once it ripens, the tannins become insoluble. They can’t bother your tongue anymore. Peace at last.
What About the Skin? Can You Eat That?
Yes, you can eat the skin of a Fuyu. It’s thin and sweet. I eat them like apples, core and all. Don’t even peel it. Who has time for that?
For Hachiya? Eh, the skin gets a bit tough when it’s ripe. It’s edible, but it’s not the star of the show. I usually scoop the inside and leave the skin behind. You do you.