Hi Simon
I cannot believe how similar my story of a dish, my mother, prepared for us as children... was to yours.
She called it something that sounded like pitchah.
It was calves' legs cooked to mish. It was garlicky. ECK!
Mom will serve it chilled with pumpernickel bread. It was jellied gook. We children hated it!
Many years later, I decided to make it, as a surprise for my Polish mother-in-law.
My parents were gone by then, so I made it from poor memory. After boiling it for forever, I remembered Mom saying then you grind it.
I was in a sweat after forcing the flesh & bones thru an old-fashion grinder.
When it chilled, I served large slab to my husband's mother.
She spit it out and had wash her false teeth thoroughly.
The ground bones turned to sand! I had fed her jellied SAND! LOL!