In a frying pan on medium heat, add all the vegetable oil, star anise, garlic cloves, cinnamon, lemon grass, chili and roast for a min.
Add the potstickers bottom down first and lay them into the pan snugly. If your pan is to small make them in batches. You should hear a good sizzle.
Once all the potstickers are in the pan, reduce the heat, add a tablespoon of water, cover and steam them for 8 mins. If you have rolled your wrappers thin enough you should be able to cook them within 10-12 mins. If they are thicker then the cooking time will increase.
Remove the lid and have a look at the doneness of the dumpling. If they are done, increase the heat and let it dry up any excess water that might be there in the pan.
Serve the potstickers with the dipping sauce while it is still hot.