Make 2 cups simple syrup, adding 1/4 cup dried lavender before heating. Let cool, then strain into an ice-filled pitcher. Stir in 2 cups each fresh orange juice and water, and strips of orange zest.
Simple Syrup: To make 2 cups simple syrup, bring 1 1/2cups each sugar and water to a boil, stirring until dissolved. Let cool.
Photograph by Jonathan Kantor