Meaning
水菜 (みずな, Mizuna) is Mizuna, a Japanese food (leafy greens, plants).
What is Mizuna?
Mizuna , Brassica rapa var. niposinica , are known as Japanese mustard greens. The taste of mizuna has been described as a "piquant, with a mild peppery flavor, slightly spicy, but less so than arugula." It is used in stir-fries, soups, and nabemono .