The term Uziza refers to the dried fruit of the West African deciduous shrub Zanthoxylum tessmannii, syn. Fagara tessmannii, a member of the 'prickly ash' Zanthoxylum family. The name of the spice is derived from Igbo, a language in Nigeria, where the spice is grown and harvested on a commercial basis. Zanthoxylum tessmannii is a close relative of the Sichuan pepper, and Uziza has a similar taste profile to the Asian spice. However, unlike Sichuan pepper where only the pericarp of the fruit is used, uziza is used whole (both pericarp and seed). This may explain why uziza has a spicier flavour and greater pungency than sichuan pepper.
Even in West Africa this is a rare spice, and typically only five or six dried fruit are added to a dish.
The whole fruit is pounded to a powder in a mortar and pestle and are added to West African 'soups' (stews) as a flavouring. Typically these would be used in soups where few or no chillies are used so that the pungency of the spice comes through.
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