Nuts

Shell

The tiger nut shell is the hard protective layer around the kernel of the sweet tuber of Cyperus esculentus, also called chufa—not a true tree nut. It is not a primary food, but it governs storage life, in-shell roasting, and how nuts move through trade. Home cooks crack shells for peak freshness; factories crack and aspirate them before packing kernels. Shell fragments are a dental hazard—inspect home-cracked meats carefully. Clean shells may be composted or used as biomass; never assume every shell is edible or safe to smoke food with. Species home range: likely Africa/Mediterranean with ancient Egyptian and Iberian use. Edible value lives in the kernel, whose flavour is sweet, coconut-almond-like, and crunchy when dried. Botanically a tuber—important for allergy communication even when sold beside nuts. Shell hardness influences whether retail sells in-shell product at all. Keep shell grit out of flour mills and blenders. Sound in-shell lots often keep longer than warm shelled kernels because the shell limits oxygen.