Cook beans, along with pandan leaves, in a slow cooker. Click here for instructions on how to cook beans.
When the beans are softened and ready to eat, add in the dried longan and the dried orange or tangerine peel. Simmer until longan fruit expands (should be about 10 minutes).
Add in a tablespoon of rock sugar and mix well. Taste, and add in another 1-2 tablespoons of rock sugar if you want a sweeter version.
Serve it hot in the winter, or refrigerate the soup for a few hours and serve it cold in the summer.
Notes
- A quick way to dry the orange peel is to slice it thinly and refrigerate the pieces for a few hours