Kangkong vs. Kale
As I've demonstrated a few times within this space, the Filipino cooking method of Adobo is quite versatile. So far I've made duck adobo, pork ribs adobo, squid adobo, and two kinds of chicken adobo. While all of these adobos have leaned towards the protein side of the meal, all manner of vegetable adobos can be prepared as well.
Yup, you can pretty much adobo-ize anything so long as you braise it in a mixture of vinegar, salt and/or soy, black peppercorns, and bay leaves.
One very common vegetable adobo is Adobong Kangkong. Kangkong, also known as rau muong in Vietnam or ong choy in China, is a leafy green vegetable eaten all over Asia. Kangkong have long hollow stems, and long, narrow, pointy leaves. Both the stems and leaves are edible.

