In a pot over medium-high heat combine water, blueberries, groundcherries (if using), fennel, vinegar, honey, lavender, salt, and fennel seed. Bring to a boil, reduce heat and simmer for 5 minutes.
Remove from heat and cool completely. Sour can be strained at this point or held with fruit and strained for service. Hold refrigerated until needed.
Chef's Tip!
Mix sipping sour with prosecco, or try lemon lime soda for a mocktail version.
