If you can't find hemp seeds, pot seeds will do. :->
My wife makes it each Christmas. She says it tastes horrible, but it wouldn't be Christmas without it. Her sons both love it so...
As my wife makes it it involves boiling the seeds, grinding them, boiling again, grinding again... repeat as many times as your patience allows.
At the last boiling add some onion, then when it's done salt and pepper to taste.
And she is Šl±sk and only makes it at Christmas..
Oh, and throw away what's left of the seeds and the onions. Siemieniotka is the broth.
And my wife tells me I shouldn't say "grind" like meat I should say "hit it and beat it" like a husband