Boil the water with the green tea leaves just until seeped. Switch off, strain and allow it to cool completely. Do not keep the tea leaves in, otherwise the tea would get bitter.
Squeeze the juice off the orange and limes and set aside.
Scoop out the passion fruit and set aside.
In a large pitcher, add all the ingredients with ice as needed and give a good mix. Add in agave nectar or honey as per sweetness required.
Serve cold with mint leaves on top.