There wasn't anything except fat, to the best of my knowledge. I was worried about it at first, but I don't think the food processor had anything to do with it since I was left with a pot full of crackling crumbs (instead of bigger pieces). I started with just enough water in the pot to keep the fat from sticking, per instructions. That should have all cooked out, but even if it didn't, the fat and water would have separated in the jars. I've since read that hog is "soft" fat and beef is "hard" fat, but even those distinctions don't explain why it is a liquid oil. I was working with only 3 lbs of fat and it rendered to 3 pint jars. I had trimmed the fat very well. I had never done this before, so I don't know what is "normal" and what isn't, but it seemed to do what it was supposed to do...except firm up! I may take one pint of it, reheat it for a bit, strain it again, and see what happens. Or I might just use it as is and wait until next time to try again. I'm just curious to know what happened and why!
Thanks,
Jill in Texas