Step 1.
- Fill a shaker with ice.
Step 2.
- Add the Irish whiskey, fresh lemon juice, orange liqueur, and simple syrup to the shaker.
Step 3.
- Shake vigorously for about 15 seconds until well chilled.
Step 4.
- Strain the mixture into a chilled cocktail glass.
Step 5.
- Garnish with a lemon twist.