If you wish to boil the dumplings ('pierogi') straightaway, then set a large pot 3/4 full of salted water on the hob.
Now prepare the dumpling dough. A detailed instruction can be found here, under the recipe for Gluten Free Dumplings with Meat Filling.
Making the filling is very easy.
All of the filling ingredients (including all those previously grated or chopped) need to be placed in a food processor with the knife blade. Blend it well, but if you wish, you can keep some texture to it, so it isn't a complete mash. You can use the filling for the dumplings straightaway.
For making the dumplings you can use a dumplings tool on the picture below, which not only cuts even circles, but also helps to stick the dumpling together.
You can also use any large cup or a small/ medium bowl as a template for cutting the circles. Then place a teaspoon of filling in the middle, fold over in half and stick two sides together by pressing a fork into them. Juts remember that you should brush the edge with a little bit of water.
To make sure that the dough won't stick to the table, sprinkle the table or worktop with a bit of the potato starch flour.
Try not to overfill the dumplings so the filling won't come out on the sides.
Ready Prawn Dumplings need to be placed, as you go, on a floured surface or a clean tea towel. If you do not wish to boil them straightaway, they can wait few hours, but remember to cover them with a tea towel, too.
When the water is boiling in the large pot, carefully place 5-7 dumplings in the water at one time (it also depends how big you made them). When they come out to the surface, lower the heat and continue boiling them for another couple of minutes and remove them with a slotted spoon. Place them on a plate and add a few knobs of butter in between or spray them with oil, so they don't stick.
Dumplings are now ready to serve!
Even though the boiled dumplings are delicious, my favourite are the leftover ones that I fry in a clarified butter the next day. The dumpling itself becomes so nice and crunchy, buttery, with a lovely Asian centre. Yum!