Tannins are everywhere in nature: in wood, bark, leaves, and fruit of plants like walnut, cranberry, cacao, grapes, and oak trees. Tannins are how plants make themselves unappetizing to animals, so they won’t eat the fruit before it’s ripe. Have you ever eaten an unripe pear or plum? That’s the tannin you’re tasting! People have used tannins to “tan” animal hides to make leather. People like tannins in their food, because it can be managed to make the food taste really good, like in chocolate, tea, coffee, and wine.
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