I picked this up off a Russian message board, where a woman allegedly got it from an old Siberian babushka. After seeing 70 more women chime in, I figured I had nothing to lose. If it failed, I'll resort to eating crappy dough or buying them at $8 a package (small package) at the Russian gorcery shop.
Stories have it that in the old times a village would gather to make these potsticker type things for the winter. They would then store them in their cold attics and survive a winter on them. My mom used to make the family gather, because traditionally, to do them entirely by hand, you do need a small army. (Of obedient children, typically)
I cheat, with a little aluminium form. The look isn't quite the same, but it cuts prep time by 2/3rds, if you're working alone.
For the magical, possibly Siberian dough:
half cup hot water
half cup hot water with tablespoon of full fat sour cream dissolved. (Or just half cup milk)
3 cups flour
1 tsp olive/vegetable/sunflower oil
1/2 lb beef
1/2 lb pork
one (grated) onion
salt and pepper
I made a mountain of 3 cups of flour on the table, with a well in the middle, into which an egg is dropped, with the hot water/milk mixture and salt and kneaded a quick doug. I've watched my grandma do this, so I like the tabletop method, but a bowl is probably safer. Less space for a runny milky floury egg disaster that way. I know this for a fact..
I wiped tiny bit of oil on top of the dough ball, and stuck it in a plastic bag to hang out at room temperature for 40 minutes. When it came out of the bag, it was like dough magic. I didn't even need to knead it anymore.
The rest is..
The thinner the better. About 2mm is just right.
This was my last batch, so I have some empty spaces in the form. The recipe yielded 4 forms of pelmeni.
It needs a tap to get them to come out.
They hang out on a floured baking sheet in the freezer for a few minutes, until the dough gets hard enough to pile them into plastic bags for storage.
I drop them in salted boiling water (with bay leaf) and 7 minutes later, plus some sour cream - dinner is served.