- the process of making rock sugar was discovered in the Tang Dynasty, and through to the Song Dynasty, they called it 'sugar frost', or 'sugar ice’
- added to teas and dessert soups
- used in sauces like for Shanghai braised pork belly dish
- in the 7th century AD, a Tang Dynasty monk in Sichuan began teaching the process of making rock sugar which began by boiling the juice of sugar cane into a thick viscous liquid and letting it flow down a bamboo pipe into an urn, where the crystals would form over time
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