Bring the water to the boil and let it cool to approx. 70°C.
Wash the mint, put it in a carafe, pour in hot water and stir in the black tea. Let the tea steep for 3-5 minutes. Depending on how strong you want the iced tea.
Pour the tea through a sieve into another carafe filled with ice cubes.
Add the sugar and lemon juice and stir until the sugar has dissolved.
Chill the mint iced tea or pour into glasses filled with ice cubes and serve.