Add 2 peaches (roughly chopped), 2 tablespoons pure honey, 2 sprigs rosemary, and 300 ml water to a small saucepan. Set to cook over medium-low heat until the peaches have softened and the rosemary is aromatic.
Cool the mixture, then add to a blender. Blend to a smooth purée.
Take ½ lemon and cut into quarters. Muddle the lemon segments by gently pressing and twisting, thereby extracting its juices. Add 150 ml sparkling water and 100 ml still water. Strain, then pour into glasses with 8 ice cubes (4 ice cubes per glass).
Optionally, garnish with extra peach slices and rosemary.
Notes
To make a sugared rim, dip your glasses in peach purée and then in sugar. The sugar will stick to the peach purée, making a decorative edge! You can store the peach purée for up to two days in the refrigerator, or freeze in ice cube trays.