How ants can kick-start fermentation to make yogurt

The art of fermenting milk to create yogurt, cheese, and kefir has deep roots in various cultures, each boasting unique traditions passed down through generations. In the lush forests of Bulgaria and Turkey, a fascinating method is employed in yogurt production: the inclusion of live red wood ants or their eggs to initiate the fermentation process. Recent research published in the journal iScience has unveiled the science behind this unconventional technique. Researchers, including co-author Leonie Jahn from the Technical University of Denmark, have noted that while modern yogurts typically utilize just two bacterial strains, traditional methods offer a rich diversity of bacteria that varies by region, household, and season. This biodiversity enhances the flavor, texture, and character of the yogurt. To delve into these ancient culinary practices, the team ventured to Nova Mahala, Bulgaria, where co-author Sevgi Mutlu Sirakova’s family still upholds these traditions. Following Sirakova’s uncle’s guidance, they embarked on recreating the traditional ant yogurt. The process began with fresh cow milk, heated to a scalding temperature—described to be hot enough to 'bite your pinkie finger.' Four live red wood ants were then sourced from a nearby colony and added to the milk. The researchers secured the milk with cheesecloth and insulated it by wrapping the container in fabric before burying it within the ant colony, utilizing the natural warmth of the nest as an incubator for fermentation. After 26 hours, they carefully excavated the container to assess the yogurt's development. The milk had noticeably thickened and soured, marking the initial stages of yogurt formation. Taste testers found it to be 'slightly tangy, herbaceous,' with hints of 'grass-fed fat,' demonstrating how nature can enhance culinary creations.