In a small saucepan, combine water, sugar and lavender. Over medium-high heat, bring to a simmer. Frequently stir to help dissolve sugar. Once the mixture simmers and the sugar dissolves, turn off heat, allow the lavender to steep for at least 30 minutes and strain.

Place cucumber slices and water in a blender and process until smooth. Place a bowl under a cheese cloth- or paper towel-lined fine-mesh sieve and pour the cucumber puree into the sieve. You will use the juice that drips into the bowl. Alternatively, you can use a juicer.

In a cocktail shaker, add the cucumber juice, gin, lavender simple syrup, egg white and lemon juice. Shake for 30 seconds. Add a handful of ice and shake vigorously until you no longer hear the ice clink against the cocktail shaker.

Pour into a chilled Collins glass and top with club soda. Garnish with a lemon twist and additional cucumber slices if desired. Enjoy!