Bulgarian white brined cheese (Bulgarsko byalo salamureno sirene)

Bulgarsko byalo salamureno sirene is a soft cheese unique to Bulgaria due to a specific lactose-tolerant bacteria used in its production process. This bacteria plays a role in converting milk into yogurt and then into sirene cheese. It is a fermented dairy product that can be made from full-fat cow's, sheep's, goat's, buffalo's, or mixed milk.

It includes added yeasts containing strains such as Lactococcus lactis subsp. lactis and Lactobacillus casei, and symbiotic yeasts from Lactobacillus delbrueckii subsp. bulgaricus. Bulgarsko byalo salamureno sirene is slightly crumbly and has a dry matter content of at least 46–48%.

In 2023, it was recognized with a Protected Designation of Origin (PDO) status by the European Union, which means that the name is reserved exclusively for cheese produced in Bulgaria using traditional methods.​