Combine the 4 cups of cold filtered water and the 4 green tea bags in a medium-sized pitcher or sealable container.

Stir in the simple syrup until dissolved into the water. Cover the container and refrigerate for a minimum of 8 hours, or preferably overnight, to allow the green tea to cold brew without becoming bitter.

Once the cold brew is complete, remove and discard the tea bags. Discard the initial tea liquid if you prefer a lighter tea flavor, otherwise proceed with the steeped liquid.

Add the sliced kiwis and the lightly muddled mint leaves directly into the cold brew pitcher. Stir gently to combine the flavorings. Allow this mixture to steep in the refrigerator for an additional 30 minutes to infuse the fresh flavors.

To serve, fill two glasses with ice cubes. Pour the kiwi mint cold brew over the ice, ensuring an even distribution of fruit pieces.

Optionally, garnish each glass with an extra slice of kiwi and a fresh mint sprig. Serve immediately.