Begin by pouring the flat water into a medium-sized saucepan. Place the saucepan over medium-high heat and bring the water to a boil, ensuring it reaches a gentle, steady simmer. This will allow the tea to steep thoroughly for a rich, balanced flavor.

Once the water has reached a boil, remove it from the heat and add the green tea bags to the saucepan. Let the tea steep for 5 minutes to infuse its full flavor. After steeping, discard the tea bags to avoid any bitterness in the drink.

If a touch of sweetness is desired, stir in the honey while the tea is still warm, allowing it to dissolve fully. Transfer the tea to a container and place it in the refrigerator to chill for at least one hour. This cooling period ensures the tea is perfectly chilled before serving.

When ready to serve, fill a glass with ice and pour the cold tea over it. Add the sparkling water to achieve the desired level of fizz. This combination provides a refreshing, effervescent base for the beverage.

For an added layer of citrus flavor, squeeze in the lemon juice. Garnish each glass with a lemon slice, enhancing both the appearance and taste of the drink.