Prep Glass: Chill your highball glass with some ice.
Muddle Raspberries: In a shaker, muddle 3 large raspberries.
Add Bitters: Add 1 dash of Peychaud's bitters.
Add Simple Syrup: Measure and pour ½ oz simple syrup into the shaker.
Add Juices: Add ¾ oz freshly squeezed lemon juice and ¾ oz freshly squeezed grapefruit juice.
Add Aperol: Measure and add ½ oz Aperol.
Add Whiskey: Pour 2 oz Irish whiskey into the glass.
Add Ice: Fill your shaker with ice cubes.
Shake: Shake vigorously for about 10-15 seconds.
Strain: Fine strain your cocktail into the highball glass over fresh ice.
Top with Soda: Fill the glass with Club soda to your liking.
Garnish: Garnish with a lemon wheel and a raspberry.