Wash the grapes really well in warm water till clean.

Combine the grapes, water and sugar in a pressure cooker and mix well.

Pressure cook on high flame for 7-8 whistles and switch off.

Allow to cool completely.

Open the lid and using a masher, mash the grapes well.

Check for sweetness and add more sugar if required.

Allow to chill in the fridge for two hours.

Flavor with rosewater and serve chilled!