In a medium-sized pot, over medium heat, pour the water, sugar and culinary lavender stir until the sugar dissolves and let it simmer.
Take it off the heat and let it steep for ten minutes, then strain the syrup into an airtight bottle.
Peel two of the lemons with a vegetable peeler and place the peels in a blender. Squeeze all four lemons (2 peeled lemons included) and then add the juice to the blender with the water.
Blend everything for 30 seconds to a minute, you will get a creamy and cloudy lemonade.
Strain the lemonade in a serving pitcher and discard the peels.
Add the lavender syrup and the vodka to the pitcher and mix well.
When you are ready to serve, add some ice to each of your desired serving glasses and pour your lavender lemonade cocktail mixture into them.
Garnish with a slice of lemon, lavender buds or a slice of lemon, enjoy!