Thanks! I haven't had any for years because I can't eat beef. I had always wondered if they could be made with pork but never tried it. I was at a farmers market where a Ukrainian refugee family was selling homemade Ukrainian food and the wind was blowing toward me. I told her I was going to eat one even if it hurt me and she told me they were pork. That sealed it.
There's nothing bad about the filling. You can put it anywhere. The only issue is that I use converted rice which I put in dry then hydrate with the tomato juice. If I used cooked rice I would stuff that stuff into anything.