1 1/2 oz. gin
3/4 oz. fresh lemon juice
1 oz. simple syrup (1:1)
1 to 2 oz. club soda
Tools: shaker, strainer
Glass: highball
Combine all ingredients, except club soda, and shake with ice. Strain into an ice-filled glass and top with soda.
From The Essential Cocktail: The Art of Mixing Perfect Drinks by Dale DeGroff. Published by Clarkson Potter.