It could be a Jam Ring, the diameter if the hole in the centre indicates that it was not manufactured by Burtons Biscuit Armaments, and is thus a cheaper version. Could be part of a Combined Biscuit Collection, which normally come out in large tins at this time of year. Rover Assortment anyone?
About 20 years ago I helped to bring several tons ashore from a small Libyan freighter riding out a storm off Co Donegal.
It was a wild night, most of them got broken and you could buy bits up at Nutts Corner for a few years after. More passed away after the Garibaldi incident, the SAS were never brought to account for that one.
There is a tape recording tucked away with my publisher's lawyer where Martin McGuiness openly admits to eating them. His day will come, I warn you, not all of them have been put beyond permanent use
Ah, looks like the Mk. 2 Tesco's own brand "Jammy Dodger-a-like". The circular hub marks it out from the standard heart shape of the true JD, as do the radiating spiral arms as opposed to the true JD's "splash" design.