Add 2 cups watermelon pieces in grinder and grind it.  Seive the juice.  Discard the pulp and the seeds

Boil 2 cups water and add green tea sachets in it.

Keep it for 5 minutes.

Take out the sachets and let the tea cool.

Boil another cup of water and add sugar in it. Let the sugar dissolve.

Simmer the gas 2-3 minutes.

Switch off the gas and let the sugar syrup cool.

Now add watermelon juice in green tea

In it add sugar syrup and chill it for 30 minutes.

Add watermelon pieces,  lemon juice  and lemon wedges in it. Serve chilled