Butter tea is a traditional food from Tibet where the caloric and micronutrient value of yak butter provided much-need sustenance against rugged terrain, bitter cold weather and a lifestyle marked by the physical hardship of mountain living. Natives to the area would drink cups and cups of the bitter, milky tea throughout the day for sustenance.
Image sourced from Nourished Kitchen. Available at: https://nourishedkitchen.com/wp-content/uploads/2015/01/Chai-Butter-Tea-Vertical-3-of-3.jpg