In a medium heavy-bottomed sauce pan, heat the water to a boil. Place the tea bags in, cover it with a lid, and take it off the heat. Allow to steep for at least 3 minutes, longer for stronger tea.
When the tea has finished steeping, remove and discard the tea bags. Add the sugar and lemon juice, and bring the mixture to a simmer over medium heat. Allow to simmer for 15 minutes, or until the syrup coats the back of a spoon. Remove from the heat and allow to cool before pouring into a jar. Store at room temperature.
To serve, spoon two tablespoons of syrup into a glass. Fill with warm water and stir until dissolved. Add ice cubes to cool the drink, and garnish with slices of lemon. Enjoy!