Caws Caerffili yw unig gaws brodorol Cymru. Cynhyrchodd Gwynfor a Thelma Adams o Caws Cenarth y caws am y tro cyntaf ym 1987 pan ddechreuont wneud caws o ganlyniad uniongyrchol i'r cwotâu llaeth. Heddiw, 30 mlynedd yn ddiweddarach, mae eu rysáit gwreiddiol yn dal i gael ei ddefnyddio i gynhyrchu Caws Caerffili ac mae’r caws hwn wedi'i enwi ar ôl Thelma, sef Caws Gwreiddiol Thelma.
‘Traditional Welsh Caerphilly/Traditional Welsh Caerffilli’ is Wales’s only native cheese. Gwynfor and Thelma Adams from Caws Cenarth first made this cheese in 1987 when they started making cheese as a direct result of milk quotas. Today, 30 years later, their Traditional Welsh Caerffili is made with the same original recipe and has been named after Thelma, as Thelma’s Original.