The tiger nut (Cyperus esculentus), also known as yellow nutsedge or earth almond, is technically not a nut. It was given this name on account of its sweet, nutty flavour, which is reminiscent of almonds or hazelnuts. The plant, which is native to tropical and subtropical regions and belongs to the sourgrass family, forms the tubers known as tiger nuts on its roots.
When dried, the nutritious tubers have a very long shelf life, which is why they are widely cultivated in their native growing regions and are often used in traditional cuisine.