Juice green grapes and strain. Similarly, juice watermelon and strain. Keep aside.
Now in a pot, bring water to boil. Once boiled, turn off the heat and to it add mint leaves, green tea bags and honey. Stir and let it sit covered for 20-30 mins.
Now mix both juices, green tea flavored water . Add lime/ lemon juice. Stir and let it chill for 4-6 hours covered.
Serve chilled over ice.
Recipe by Naive Cook Cooks at https://www.naivecookcooks.com/iced-green-tea-punch/