Stem Lettuce: Stir-Fry and Salad

Stem lettuce is one of the vegetables that I wished to try this year. As I already tried arrowroot/arrowhead, chìh-gû 慈姑, so far I still have 3 more (from my list) to taste. However I know that there are many more local vegetables to discover as well as herbs and fruits {such as Chinese olives, myrobolan -also known as Indian gooseberry, etc.}