This is Tamil Nadu’s famous Cumbum Panneer Thratchai, also known as Cumbum grapes. The Cumbum grapes recently earned the Geographical Indication tag or GI tag.
The Cumbum valley located at the Western Ghats in Tamil Nadu is known as the ‘Grapes city of South India’ and cultivates the Panneer Thratchai. This variety which is also known as Muscat Hamburg constitutes almost 85% of the grape-growing areas in Tamil Nadu.
The Panneer grapes were first introduced in Tamil Nadu in 1832. They are rich in vitamins, tartaric acid and antioxidants and reduces the risk of some chronic diseases. They are also known for a superior taste, apart from the purplish-brown color.
Source: thehindu.com