Put the ginger in a saucepan set over a low heat with the lemon peel, sugars and 500ml water and stir until the sugars have dissolved. Increase the heat to medium, then simmer for 15-20 mins, or until reduced and syrupy. Remove from the heat and leave to cool completely.

Strain the syrup into a jug through a sieve lined with muslin. At this stage, you can transfer the syrup to a small sterilised bottle or jar and keep in the fridge for up to two weeks.

Pour the ginger syrup into a large serving jug. Tip in the lemon juice, fill with ice and top up with the soda water. Serve garnished with a few mint sprigs.