Chestnut is the fruit of a tree species that is particularly widespread in the northern hemisphere. The scientific name of these trees is "Castanea". Chestnut fruits have a hard outer shell and contain an edible seed inside. These fruits, which usually ripen in the autumn season, are consumed by people especially in temperate regions.

Chestnuts are mostly consumed by frying, boiling or baking. They can be used in sweet or savoury recipes. Chestnuts are also used as flour or puree. Chestnut flour in particular is used in baked goods and dishes as a gluten-free alternative.