Make ahead: If you mix everything except the ice together ahead of time, you can keep the mixture for up to 2 days. Keep it refrigerated and in an airtight container. Give it a good shake before serving it though.
Make it lavender colored: Stir in 2 drops of blue and 1 drop of purple food coloring to your syrup after the buds have been strained and removed. For a natural colorant, you can even add a few blueberries to the boiling syrup. Simply allow the berries to burst in the saucepan and strain out the skins along with the lavender buds.
Use freshly squeezed lemon juice: You'll find fresh lemon juice gives this cocktail a fresh flavor, and you can add some lemon peel or a lemon twist as a garnish if you have fresh lemons.
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