It's so dense that a single knuckle-sized piece can take up to five hours to fully soften in the mouth — locals treat it less like a snack and more like a slow-release stick of gum.
Yak milk is boiled, strained, and pressed into small hard blocks, then air-dried until they turn nearly rock-solid. Haa's highland herders string them up by the dozen and sell them in the district's shops and markets, where they're known locally as Haabey ruto — 'the hard thing from Haa.'