Fill your shaker or mason jar with plenty of ice cubes.
Pour in the peach juice, lavender syrup, and lemon juice.
Pop the lid on and shake for about 10 to 15 seconds to chill and mix it all up.
Strain into a tall glass filled with fresh ice.
Slowly top with sparkling water.
Stir gently with a bar spoon so you don’t lose the bubbles.
Garnish with peach slices and, if you’ve got them, a little lavender sprig.
Sometimes, I’ll rim the glass with sugar for a little sparkle—totally optional.