Zenbird Editorial TeamJA Okinawa and Ehime Kaju Food have launched a joint project to transform discarded Shikuwasa peels into premium food ingredients. This partnership aims to address the annual disposal of approximately 500 tonnes of peel waste generated during the juicing process of the Okinawan lime into new upcycled ingredients.
Shikuwasa is a signature agricultural product of Okinawa Prefecture with growing market demand. However, the peels remain difficult to process for human consumption. The fruit contains high levels of functional compounds such as nobiletin and tangeretin, but the juicing process typically ruptures oil glands, releasing intense bitterness. Furthermore, the tough texture of the white pith, known as albedo, often results in an unpleasant mouthfeel and off-flavours. These factors limit the use of peels to livestock feed, compost, or limited supplement extraction.
Ehime Kaju Food, based in Ehime Prefecture, leveraged on its 60 years of expertise in citrus processing to overcome these obstacles. The company developed a method to suppress the bitterness and acridity from the Shikuwasa peel while firmly retaining its aromatic taste. They have even successfully produced a Shikuwasa sauce, which is technically more demanding to produce than a puree because without advanced citrus processing techniques.
The upcycled ingredients offer new possibilities for Okinawan souvenirs, tourism-related gastronomy, and the wider beverage market. The project effectively gives a second life to unused resources and enhances the brand value of Okinawan agricultural products.
[Reference] PR Times (Japanese)
