Eggs, often quail eggs, braised in soy sauce and spices and dried again and again until small, black and very chewy. A Taiwanese snack, sold loose or in vacuum packs.
A Taiwanese specialty from Tamsui (淡水). Eggs are repeatedly braised in soy sauce and spices then air-dried over 7+ days, leaving them dark, shrunken, and extremely chewy. Invented by Mrs. A-Po (阿婆) when overcooked noodle-stall eggs turned out surprisingly delicious.