Tom Collins

- 45 ml (1 1/2 oz.) dry gin
- 30 ml (1 oz.) lemon juice
- 15 ml (1/2 oz.) simple syrup
- 90 ml (3 oz.) club soda
- Ice cubes
- Half lemon slice
Combine all ingredients, except for the half-lemon slice, in a highball glass containing a few ice cubes.
Stir using a mixing spoon.
Garnish with a half lemon slice.

