1.5 oz Sláinte Irish Whiskey
¾ oz blackberry liqueur
¾ oz lemon juice
¾ oz blackberry simple syrup
¾ oz egg white or aquafaba optional
Combine all ingredients except the garnish in a shaking tin with one ice cube and shake for 30 seconds.
Open the shaker, fill with ice and shake a second time, 30-60 seconds.
Double strain into a chilled coupe and garnish with blackberries and lemon