Step 1.
- Prepare a coupe glass by rimming the outer edge with lemon juice, then dip it into sugar to coat the rim.
Step 2.
- In a cocktail shaker, combine the Irish whiskey, fresh lemon juice, simple syrup, and Angostura bitters.
Step 3.
- Fill the shaker with ice and shake vigorously until well chilled.
Step 4.
- Strain the mixture into the prepared glass, avoiding the sugared rim.
Step 5.
- Garnish with a twist of lemon peel, expressing the oils over the drink.