First, make the apple thyme simple syrup by boiling the apples, thyme, sugar, and water together.
Strain the syrup, let cool, then add to a cocktail shaker and muddle.
Pour the muddled apple thyme syrup into a cocktail glass.
Add the bourbon, lemon juice, and soda water to the cocktail.
Garnish the cocktail with fresh apples slices, dried thyme. & serve!