Step 1.
- Fill a shaker with ice cubes.
Step 2.
- Add gin, lemon juice, and simple syrup to the shaker.
Step 3.
- Shake vigorously for about 15 seconds.
Step 4.
- Strain the mixture into a highball glass filled with ice.
Step 5.
- Top with champagne gently to retain the fizz.
Step 6.
- Garnish with a twist of lemon peel. Serve immediately.