Lavender syrup has long been made in Provence, France, where fields of fragrant lavender bloom every summer. This homemade version uses freshly harvested culinary lavender blossoms to create a delicate floral syrup that pairs beautifully with coffee, tea, lemonade, sparkling water, cocktails, and desserts. The flavor is subtle and elegant—never overpowering—when steeped for the proper amount of time.

   The butter must be taken out of the refrigerator in advance because for this recipe it must be soft.