Add the mixed berries and honey (or syrup) to the shaker.
Muddle berries well to release their juice.
Pour in fresh lemon juice.
Fill the shaker with a handful of ice cubes.
Secure the lid and shake for at least 10 seconds to chill the mix.
Strain the liquid into a tall glass full of ice, leaving the seeds and pulp behind.
Slowly top with sparkling water to fill the glass.
Stir gently to blend, then garnish with lemon, berries, or mint if desired.
I serve the drink right away while it’s cold and fizzy.