Tatsoi (Brassica narinosa or Brassica rapa var. rosularis) (塌棵菜, 瓢儿菜、乌塌菜, or 塌古菜 in Chinese), also called spinach mustard, spoon mustard, or rosette bok choy, is an
Asian variety of
Brassica rapa grown for greens. This plant has become popular in
North American cuisine as well, and is now grown throughout the world.
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Also known as 'spoon cabbage,' tatsoi is a leafy Asian green with a slightly spicy cabbage flavor. It can be used in salads and stir-fries.