Flour a clean surface
Roll out the dough very thin, like 1 cm if you can, making sure it's floured well so it doesn't stick
With a cup or a cookie cutter, cut circles until theres no dough left. Flour the dough discs so they don't stick together
Place a tsp of filling into the dough disc and seal them by pinching the sides (youtube if necessary)
Once done, brush the excess flour off the dumplings
In a skillet, heat the sesame oil
Put the dumplings in the skillet, and brown them 2 mins
Mix the water, corn flour, soya sauce and sesame seeds
Pour the liquid mixture, lower the heat, and cover the skillet for 5-7 mins until water has evaporated and dumplings have steamed
Remove the cover and cook on high heat for another 2 min
You can freeze the uncooked dumpling leftovers and store the extra filling in fridge