This is Mongolian food. Aobao is Mongolian, which means "Duizi". It is also translated into "Naobao" and "Ebo", which means wood, stone and mound. It is a man-made "stone pile", "earth pile" or "wood pile". In the past, it was all over Mongolia, mostly made of stone or sand, but some were made of branches. Today, this number has been greatly reduced. At first, it was a symbol of people's roads and realms made of stones on the vast grassland, and later it gradually evolved into a symbol of offering sacrifices to mountain gods and road gods and praying for family members' harvest, happiness and peace.