Tat soy is tangy and the stem is juicy. It is often found in bags of mixed baby lettuces or in braising mixes. It may be used as a salad green or used in many of the "greens" recipes.
A simple way to prepare tat soi is to heat a little olive oil (1 Tablespoon is plenty), and cook just until the greens are wilted but the stems are still crunchy. Add a drizzle of sesame oil and freshly grated ginger for added flavor