The three treasures of Chaozhou are the old citron , the old medicinal orange and huangpi fruit . They are Chaozhou cold fruit specialties in the best, in the Chaoshan region cold fruit community, has a pivotal position, favored by the Chao people and renowned at home and abroad, so it is known as the three treasures of Chaozhou.

The old citron (Buddha's hand melon) production technology is a traditional food craft in the Chaoshan region of Guangdong Province. It has an aged or crispy taste, superior quality, original fruit flavor and was named "national new product", and is known as the treasures of cold fruits by foreign businessmen.

With its unique flavor and with digestion and appetite, fat loss, phlegm, cough and other effects by consumers as "China's best". 2009 was selected as Guangdong provincial intangible cultural heritage list.

Old citron (Buddha's hand melon) more traditional and ancient processing technology route, namely: raw materials - cleaning - broken skin salting - preservation - sun-drying - cleaning - pot steaming softening - candied ingredients - sugar pot treatment - glass sun drying - warehousing - packaging factory. One of the sugar pot treatment is the key control point, such as sugar pot treatment in the sugar dipping ingredients before processing, will result in low amount of sugar, dosing is not uniform, resulting in poor taste, low yield, wear and tear and other shortcomings.

So the sugar pot treatment in the candied ingredients after the product can be sterilized at high temperatures, but also make the original sugar and ingredients and other distribution, but the temperature should not be too long high temperature, should maintain high pressure and high temperature in 20 minutes or so, otherwise it is easy to make the product loss of beneficial substances.