Horse hoof trimmings . . .
Some years back when I was looking for a recipe, I
was given a scribbled paper with what sounded
like a good formula, and one of the key ingredients
was hooves and trimmings that were roasted/charred
and ground. I approached a couple of farriers about
their waste, and apparently it's a sought after
something so that what would otherwise be trash
is spoken for. Too much trouble to pursue any
further, and I wasn't going around looking for
beaver grease to go with it, so I scratched that off
But sincere thanks anyway for the suggestion