Wash and cut the Grapes into pieces. Also peel the Ginger and squish it along with the Green Chilli.
Change the Grapes, Curry leaves and Green Chilli to a Vessel and add about one cup of water.
Boil this mix for about 5 - 10 minutes in medium flame.
After 5 - 10 minutes, put off the stove and cover the Vessel with a plate and keep it aside for about five minutes, then remove the cover and allow to cool the mix.
Change the boiled water into another vessel and grind the boiled Grapes, Ginger, Curry leaves and Green Chilli in a Mixer and add the paste into the already kept boiled water and stir it well. Then filter this mix/squash, add Salt and Sugar also and stir it well and keep to cool.
Grapes Lemon Squash is ready. (If this squash is kept in fridge it can be used for about 2 - 3 days).
Cut required quantity of Lemon and extract the Juice into a glass/vessel, add required quantity of Cumin seeds powder, and Squash. Also add water and Ice cubes (only if necessary) and serve the tasty Grapes, Lemon juice.