Pelmen

Stick the edges together and join the ends to form a pelmen.

Source: wiktionary

According to an old tradition, the cook puts some object like a button into one pelmen, instead of the filling.

Source: wiktionary

Every piece is folded in dough like a pelmen and boiled.

Source: wiktionary

It’s better to use a spoon, preferably a wooden one. This way a pelmen keeps inside the meat broth made during the cooking, and so the dish stays juicier. There’s also a variety of traditions connected with pelmeni, like making “the lucky” pelmen with some different filling. It is believed that the person who gets a pelmen with pepper will meet his love, the one finding the pelmen with sugar will be happy, with a coin inside – will be rich.

Source: wiktionary