- Specializing in the cheese industry. - The process of producing Gruyère AOP is highly regulated and follows a strict procedure that is closely monitored by milk producers, cheese makers, and refiners. Since 2001, this expertise has been protected by specifications that have been approved by the Federal Office for Agriculture. - The PDO, or Protected Designation of Origin, is a certification that acknowledges the exceptional quality of specific products that are associated with a particular region, giving them a distinct character and an unmatched taste.