Step 1.
- Fill a shaker with ice.
Step 2.
- Add 2 oz of Scotch whisky.
Step 3.
- Pour in 1 oz of freshly squeezed grapefruit juice.
Step 4.
- Add 0.75 oz of simple syrup (adjust based on sweetness preference).
Step 5.
- Shake vigorously for about 15 seconds until well chilled.
Step 6.
- Strain into a chilled coupe glass.
Step 7.
- Garnish with a twist of grapefruit peel.