Step 1.
- Fill a highball glass with ice cubes.
Step 2.
- Pour 30ml of soju over the ice.
Step 3.
- Add 45ml of grapefruit juice.
Step 4.
- Top with 15ml of tonic water for a refreshing fizz.
Step 5.
- Gently stir to combine the ingredients.
Step 6.
- Garnish with a lemon wheel on the rim of the glass.