@Chmander - Though I don't know for sure, I do know that it's made in a very similar fashion. In fact, one time, I heard the story about the discovery of yogurt. Ages ago, a nomad was traveling in the desert with a sack of milk. Though he was successful in his travels, his milk had "spoiled" in the hot sun. However, when he had went to taste it, it was still edible, and was basically a milky curdled substance. This is how yogurt was discovered.