Nuts

Skin

Hickory skin, or pellicle, is the thin seed coat on the kernel of nuts of Carya species native mainly to North America after shelling. It holds tannin, colour, and a mild bitterness that can help rustic baking or hinder pale confectionery. Against the sweet interior, skins add astringency around a core flavour of sweet to bitter depending on species—shagbark is prized, bitternut is not a dessert nut. Blanching or roast-and-rub methods remove skins when a cleaner look is required. Leaving skins on increases flecks in meals and cookies. Species process habits: species identification matters; crack hard shells; cure kernels. Do not grind bitternut hickory for dessert paste; species choice is the recipe. Skin-on or skin-off, the allergen picture is still tree nut (walnut family). For fine pastes, skin specks dull colour; for whole-food butters, skins are often retained. Do not confuse seed skins with hard outer shells—the techniques differ completely. Removed skins are usually discarded or composted in home kitchens.