Tatsoi Mustard Green is a non-heading mustard that is very similar in flavor to spinach and bok choi. Tatsoi plants will grow dark-green spoon-shaped leaves into a beautiful flat rosette shape. It is widely used in East Asian cuisine and can be eaten raw or stir-fried. Tatsoi is nutrient rich containing Vitamins A, C, beta- carotene, calcium, folate, fiber and phytonutrients.