Carefully choreographed, highly coordinated and precisely timed, the sourdough baking process is like a dance. Peter Mitchell wakes before dawn to begin this dance, turning water, flour and salt into perfectly baked loaves, croissants and even cinnamon rolls. What was once just a hobby for Peter and Makenzie has now become The Sour, a bakery and coffee shop in downtown Rapid City that was recently named one of the best bakeries in America by the New York Times.