Anyone ever made zwieback?

I'm have a feeling that most of the readers of this blog have probably tried zwieback, a Russian Mennonite bread roll consisting of two lovely round balls of dough one on top of the other. Zwieback always used to be a central part of all family reunions on my mom's side of the family until my Grandma passed away almost ten years ago. Now the only time we ever eat it is when my Uncle Mike picks some up from a baker in Yoder.

The reason I'm wondering is because I intended to learn to master the art of zwieback baking when my Grandma was still alive and thus carry on the tradition. That however, didn't happen. Yet almost ten years later, as my domestic side is awakening I once again feel the urge to truly master the art of making zwieback. And believe me, I know it's not an easy task! My Grandma gave me one lesson and the recipe, which she said she didn't actually follow (go figure). So now all I have to go on is an unused recipe and a vague recollection of a very precise squeezing motion needed to produce those perfectly round balls of dough--a motion I didn't get close to mastering after that one lesson.

If anyone out there can give me any zwieback advice, send me a recipe that actually has been followed, or better yet train me in this complicated art, I would be ever so happy!