Komatsuna

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. The name komatsuna is from the Japanese komatsuna(小松菜, コマツナ), "greens of Komatsu," a reference to Komatsugawa Village where it was heavily grown during the Edo Period. It is stir-fried, pickled, boiled, and added to soups or used fresh in salads. It is an excellent source of calcium.