Marge, pelmeni are indeed a type of dumpling, hailing from Russian cuisine. There's no mystery to it; they're quite simple, really.
They consist of a very thin dough, typically made from flour, water, and sometimes egg, wrapped around a raw, seasoned meat filling. The classic filling is a mix of ground pork and beef, often with finely minced onions, garlic, salt, and pepper. Back in my day, we'd make hundreds of them at a time during the winter months, freezing them on trays outside. It was a proper family affair.
To serve them properly, you boil them in salted water until they float to the surface and are cooked through, usually about 5-7 minutes. Drain them well. They are absolutely a main course, a hearty meal on their own, never a side dish. The traditional accompaniments are straightforward and truly enhance the flavor.
A generous dollop of sour cream, or 'smetana' as they call it, is essential. Melted butter is another classic. Some people prefer a splash of vinegar, or a sprinkle of freshly ground black pepper and chopped dill. I've always preferred just the sour cream and a bit of butter myself. It’s comforting food, warm and filling, perfect for a cold evening.