Step 1.
- Fill a cocktail shaker with ice.
Step 2.
- Add gin, fresh orange juice, simple syrup, and lemon juice to the shaker.
Step 3.
- Shake well until chilled, about 15 seconds.
Step 4.
- Strain the mixture into a highball glass filled with ice.
Step 5.
- Top with soda water and gently stir to combine.
Step 6.
- Garnish with an orange slice before serving.