In a medium bowl, combine roughly chopped Blackberries (1 pint), Dried Lavender Bulbs (1/4 teaspoon) and Granulated Sugar (1 cup). Cover and refrigerate for 24 hours.
Arrange a fine mesh sieve over a bowl. Strain fruit mixture into the bowl and press to extract all juices.
Add Champagne Vinegar (1 cup) and whisk vigorously.
To use, fill a glass with Ice (to taste) and Carbonated Water (to taste) and stir in 1 tablespoon of the shrub; add more to taste. Serve and enjoy!