Place the blueberries in a small saucepan with 1 tablespoon of water. Heat over medium-low heat until the berries burst and become liquidy. Transfer the mixture to a blender or food processor and blend until pureed and smooth. You can strain this mixture through a fine mesh sieve if desired, but I don’t mind any little flecks of blueberry.
Add 2 tablespoons of the blueberry puree in the bottom of the glass. Add the lavender syrup and stir. Add the fresh mint leaves and muddle them in the bottom of the glass. Add ice to the glass, and pour rum, soda and lime juice. Mix with a long spoon or knife and serve with an additional sprig of mint.
lavender simple syrup
Place the sugar, water and lavender in a saucepan over medium-low heat. Whisk until the sugar dissolves, bringing the mixture to a simmer. Cook for 1 minute. Turn off the heat and set the saucepan aside. Let it cool completely. Strain the mixture through a fine mesh sieve to remove the lavender. Store in a sealed container in the fridge!