Juice the lemons, and remove any seeds. You should yield about 1/3 cup of lemon juice.
Combine the lemon juice and honey in a high speed blender and been until honey has fully dissolved and the concentrate is frothy.
Divide the concentrate evenly into 4 glasses, or pour into a pitcher. Sprinkle the lavender sprigs over the concentrate than fill the glass/pitcher with sparkling water. (you can either chill the sparkling water prior to serving or add ice if you prefer.