Add apple slices to the cocktail shaker and muddle gently to release the flavors.
Add apple cider, cinnamon syrup, lemon juice, and a dash of ground cinnamon to the shaker.
Fill the shaker with ice, secure the lid, and shake vigorously for 15-20 seconds until well-chilled.
Fill a highball glass with fresh ice cubes.
Strain the mixture into the prepared glass.
Top with ginger ale or sparkling water.
Stir gently with a bar spoon to combine all ingredients.
Garnish with a fresh apple slice and cinnamon stick.
The drink should have a light amber color with a refreshing apple aroma. The foam on top from shaking gives it a professional appearance.