Wash the lemon and slice it. Place it in a big glass jar or a bottle.
Add Ceylon cinnamon sticks, peppermint leaves and pour in the water. Let it infuse for at least 2 hours at room temperature.
Before serving, add frozen raspberries to cool the water and add some extra flavour.
If you leave the raspberries in the water for longer period of time, the water will turn pink and it will have a fruity flavour. You don't have to worry about the sugar content of 12 raspberries per 2 litres of water and you can enjoy this potion throughout the day!