ask/A.S.K. What is this mysterious veggie?

The plant in question was grown in the Central Coast and purchased at the Altadena Farmers Market in an effort to try new things.

It goes by many names: Yu Choy, Yu Choy Sum, Cantonese Pak Choy, Cai Xin, Tsoi Sim, Yiu Tsai, Tsai Hsin, Yintsai Sim, Edible rape, Hon Tsai Tai (Hontsaitai), Red Choy Sum and essentially it is a flowering Chinese cabbage and can be steamed, boiled, or sauteed.