In Bulgaria, yogurt is called sour milk, and has a long and storied history that is said to date back at least 4000 years. A mildly sour-tasting yogurt, kiselo mlyako, is their invention and heritage, and is considered the best and healthiest of all dairy products currently available to consumers. This is the foundation for Trimona Yogurt. Bulgarians consume close to 400,000 tons each year, and consider their yogurt the best. None of the yogurts from a dozen countries outside the Balkans tastes anything like the Bulgarian variety.