Step 1.
- In a shaker, combine the gin, pineapple juice, lemon juice, and simple syrup.
Step 2.
- Fill the shaker with ice and shake vigorously for about 15 seconds.
Step 3.
- Strain the mixture into a highball glass filled with ice.
Step 4.
- Top with soda water and stir gently to combine.
Step 5.
- Garnish with a slice of pineapple on the rim of the glass.