Not “a vegetable” but the “A” vegetable. There is not B vegetable or C vegetable, but there is the A vegetable. It looks like romaine lettuce without the bony white stalk, and it’s mild enough to eat raw in salads. As pictured here, it also stir fries up beautifully. I took this picture in Din Tai Fung in Taipei, and then I ate everything in sight.
I discovered the A Vegetable in Taiwan, and ordered it many times. In grocery stores, the label said A Vegetable. On menus, A Vegetable. Now that I’ve left Taiwan, I can’t find it anywhere. I guess we were just ships that passed in the night.