Yak Milk

Source
Yak Milk is sold for (each) by:
 * in the Shrine of Two Moons
 * in the Shrine of Two Moons
 * in the Shrine of Seven Stars
 * in the Valley of the Four Winds

Cooking

 * Pearl Milk Tea
 * Rice Pudding
 * Tangy Yogurt
 * Yak Cheese Curds