As a child in England, my Mum would make this with a pigs head, but later in life she used pigs "trotters" and pork hocks. I still have her recipe and one day had a craving for this. It wasn't easy finding the trotters, but one day my husband went to our local grocers and there they were! Serve on hot buttered rye toast. The contrast of heat and cold is fabulous!