Place 1 1/2 cups blueberries, sugar, lemon zest and half a cup of water in a small saucepan over a high heat. Stirring constantly, bring to the boil and reduce heat to a low simmer for 5 minutes. Remove from heat and strain through a fine mesh sieve placed over a bowl.

Using a spatula or spoon press blueberries through sieve to remove all additional juice. Discard seeds and skin and place juice into a 1-1.2litre capacity jug.

Add lemon juice, ice cubes, remaining blueberries and top with sparkling mineral water. Garnish with mint and serve.