Place the sugar, water, lavender and vanilla bean 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. Stir in the vanilla extract. Store in a sealed container in the fridge! The syrup will make about ½ cup.
Fill a large glass with ice. Add the milk and syrup and stir together well. Pour in the espresso shots and stir. Garnish with a sprig of fresh lavender. Serve immediately!