Chaoshan is located in the southeast of Guangdong, where there are many kinds of fruits in the four seasons, and it is known as the "hometown of candied fruit". Among them, the most famous candied fruit is the old medicine orange, old fragrant yellow and yellow-skinned douchi, which is known as the "three treasures of Chaozhou".

Chaoshan area is rich in food culture, mostly for light health preservation. "Three Treasures of Chaozhou" is the concentration of healthy diet in chaozhou people. They are all medicinal foods with high medicinal value, among which the old medicine orange is the best in candied fruit.

The old medicine orange is made of local excellent kumquat as raw material and licorice, salt and honey as auxiliary materials. Kumquat itself is sour and sweet, producing saliva to quench thirst. It is made by the traditional ancient decoction technology, and it is repeatedly evaporated for nine times. Finally, the old medicine orange is stored in the altar.