Their famous Pwll Mawr cheddar is aged 300ft below ground at the bottom of the mine shaft at the Big Pit Mining Museum.
Mae eu caws cheddar Pwll Mawr enwog yn aeddfedu 300 troedfedd o dan y ddaear ar waelod siafft y pwll glo yn Big Pit: Amgueddfa Lofaol Cymru.