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B. rapa var. perviridis
|Brassica rapa var. perviridis|
|Nutritional value per 100 g (3.5 oz)|
|Energy||92 kJ (22 kcal)|
|Dietary fiber||2.8 g|
|Vitamin A equiv.|
|Pantothenic acid (B5)|
|†Percentages are roughly approximated using US recommendations for adults. |
Source: USDA FoodData Central
Komatsuna (コマツナ（小松菜）) or Japanese mustard spinach (Brassica rapa var. perviridis) is a leaf vegetable. It is a variety of Brassica rapa, the plant species that yields the turnip, mizuna, napa cabbage, and rapini. It is grown commercially in Japan and Taiwan. It is a versatile vegetable that is cooked and eaten in many ways. The plant is also used for fodder in some Asian countries.
The name 'komatsuna' means 'greens of Komatsu' in Japanese, a reference to the village of Komatsugawa in Edogawa, Tokyo, where it was heavily grown during the Edo period. It was named by Tokugawa Yoshimune, the eighth shogun, who visited Edogawa in 1719 for hunting and stopped at the local Katori Shrine for lunch. The shrine priest served him soup with a rice cake and a local leaf vegetable. The shogun was impressed by the flavor of the vegetable so much and named it komatsuna, after the nearby Komatsu River (which gives Komatsugawa its name). Till this day, the Shin-Koiwa Katori Shrine offers komatsuna to the deities on New Year's Eve. People who come to the shrine to pray on New Year's Day are also given komatsuna for good luck in the new year.
Since the days of the shogun, komatsuna has been bred to have a sweeter taste. The old variety thought to have been served to the shogun is not widely available. That variety is called Goseki bansei. It grows faster and has bigger but fewer leaves than ordinary komatsuna, and a strong, spicy flavor.
The leaves of komatsuna may be eaten at any stage of their growth. In a mature plant they are dark green with slender light green stalks, around 30 centimeters (12") long and 18 cm (7") wide. It is most often grown in the spring and autumn, as it cannot endure extreme heat or cold for more than a short time. Although nowadays it's grown year-round in green houses.
Komatsuna has a fresh, sweet taste and a crunchy texture. It is a very versatile vegetable and can be eaten raw, pickled, stir-fried, boiled, used fresh in salads, or added to soups. It is popular in soups as it can stay firm after being simmered. It is an excellent source of calcium, vitamin A, and vitamin C.
- "小松菜 （こまつな） - 語源由来辞典". 語源由来辞典. Retrieved 20 May 2015.
- "Cultivating pure tastes from the past". The Japan Times. Retrieved 13 February 2020.
- Queensland Government, Department of Primary Industries and Fisheries. "Komatsuna: Commercial Production". Archived from the original on 23 August 2009. Retrieved 27 June 2007.