Step 1.
- Chill an Old Fashioned glass by filling it with ice water.
Step 2.
- In a shaker, combine 2 oz of pisco and 1 oz of whisky with ice.
Step 3.
- Shake well until chilled, about 15-20 seconds.
Step 4.
- Discard the ice water from the chilled glass.
Step 5.
- Strain the mixture into the chilled Old Fashioned glass.
Step 6.
- Garnish with a lemon twist.