Sage Derby Cheese is a mild speciality cheese from Derby, England, made out of cow’s milk. It’s a semi-hard cheese, mottled green and with sage flavour.

Sage Derby is aged one to three months and has a fat content of 45%. The cheese is made in 4-13.5kg (9-30Ib) cylinders. (Cheese).
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I always wondered how that green marberllization occurred! – Kat
Me too!
Liz