Disclaimer: The characters in this story do not belong to me, but are being used for amusement only, and all rights remain with the estate of JRR Tolkien.
Sam remembered the preparation that went into making a fruit jelly. The smell of boiling hooves filled the place for hours, as did the steam; you could really only do it in summer when the door could be left open.
Then came the juicing of berries – blackberries and blackcurrants would stain your fingers for days. A jelly was for special occasions.
But here they boiled fish-bones, or a plant from the sea, to set their jellies; and fruit that was rare in the Shire could be plucked straight off a tree. Oh how Rosie would have loved this orange delight!
Notes - until gelatine became commercially available in the 1750s or so jelly was indeed made starting with cows feet. Americans call jelly Jell-O after the first commercially available gelatine there.
Jellies can also be set with isinglass (made from fish bones) or agar-agar made from algae.