Overview

Iru is a traditional fermented condiment produced from African locust bean seeds and widely consumed in southwestern Nigeria. It is obtained through spontaneous alkaline fermentation and is commonly used as a seasoning in soups and stews.

Raw Materials

  • African locust bean seeds (Parkia biglobosa)
  • Water

Fermentation Process

Locust bean seeds are boiled to soften the cotyledons and then allowed to ferment naturally for 2–3 days at ambient temperature. During fermentation, microbial activity leads to extensive protein breakdown and the development of characteristic aroma and flavour.

Microbial Ecology

Fermentation is dominated by:

  • Bacillus spp.

These microorganisms produce proteolytic enzymes that hydrolyse seed proteins and contribute to the alkaline nature of the product.

Functional and Nutritional Aspects

  • Enhanced protein digestibility
  • Development of strong characteristic flavour
  • Used in small quantities as seasoning

Cultural Significance

Iru is an essential component of traditional Yoruba cuisine and plays an important role in enhancing the flavour of vegetable and meat-based soups.

References

  1. Odunfa, S. A. (1985). African fermented foods. Food Microbiology, 2, 155–164.
  2. Achi, O. K. (2005). The potential for upgrading traditional fermented foods. African Journal of Biotechnology, 4(5), 375–380.
  3. Steinkraus, K. H. (1996). Handbook of Indigenous Fermented Foods. Marcel Dekker.