The dough wants to rest half an hour or it fights you at the rolling stage and tears at the sealing stage. Fill while the potato is still warm, and boil in genuinely a lot of water — crowded varenyky stick to each other and come apart.
It did not make it into the plan for these seven days.
The method above is what decides the dish, not a step-by-step recipe. The link runs a web search on the name: this page has no vetted sources of its own, and will not invent any.