03.

Shīkwāsā

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seasonal peak
August
Shīkwāsā, a citrus that has long grown wild in Okinawa, is one of the few aromatic sour citrus fruits indigenous to Japan. In the Okinawan language, shī means “sour” and kwāsā means “to feed.” Shīkwāsā is known for its refreshing tartness and is rich in carotene, vitamin C, citric acid, and potassium—nutrients that are essential for coping with Okinawa’s hot climate. In addition, shīkwāsā juice contains high levels of nobiletin, a polyphenol that has attracted attention for its health benefits, making this a fruit that is valued for supporting overall health. Its strong acidity means the juice can be squeezed over sunui (mozuku/vinegared seaweed) in place of vinegar, or added to awamori or beer, and is used much like lemon to enhance the flavor of food and drinks.
See restaurants where you can eat this ingredient