Prepare the Glass: Fill your highball glass with ice cubes to chill it while you mix the cocktail.

Mix the Ingredients: In a cocktail shaker, combine the elderflower liqueur, fresh lemon juice, and fresh orange juice.

Shake It Up: Add ice to the shaker, secure the lid, and shake vigorously for about 15 seconds to blend the flavors well.

Strain the Mixture: Remove the ice from your glass and strain the cocktail mixture into the chilled highball glass.

Top It Off: Gently pour the sparkling water or club soda over the cocktail, giving it a light stir to combine.

Garnish: Add lemon and orange slices on the rim of the glass for decoration. If desired, you can also add a sprig of fresh mint for an aromatic touch.

Serve and Enjoy: Your Elderflower Citrus Fizz is ready to be enjoyed! Take a moment to appreciate its beautiful colors and refreshing aroma before taking that first sip.