Cut the two pods off and then carefully wash the edamame.
Then soak the edamame into slightly salted water, soaking for 15 to 30 minutes.
Then reload the pot with clean water, add salt, star anise, Sichuan peppercorn and 1 or 2 dried chili peppers. Bring to boil and cook for 10 minutes (crisper taste) to 15 minutes (softer taste) with the lid uncovered.
Transfer out immediately and cool down naturally.
Notes
If you love natural aroma of beans, skip light soy sauce. Otherwise, you can add some light soy sauce for a stronger taste.