Teacakes do not have jam.You've been mislead.
(
Quijibo Esq. BSc. May contain traces of nuts,
Fri 28 Nov 2008, 12:09,
archived)
There's definitely a jammy middled similar devicemaybe its a supermarket's own one
(
HappyToast Groat froth,
Fri 28 Nov 2008, 12:13,
archived)