It's Bhutan's answer to Japanese natto — sticky, pungent fermented soybeans that eastern families have kept as a closely guarded kitchen secret for generations.
Boiled soybeans are wrapped and left to ferment for several days until sticky and intensely savory, then pounded into a paste with chili and other seasonings to eat alongside rice or kharang. It's a homemade condiment in the warmer foothill villages of eastern Bhutan, rarely sold and mostly passed down through family kitchens.