1 1/2 oz gin
Juice of 1/2 lemon
1/4 to 1/2 oz simple syrup, or 1/2 tsp sugar
2-3 oz soda water
Build on the rocks in a short highball glass (what was once called, appropriately enough, a "Collins" glass). Garnish, if you like, with a cherry and orange or lemon slice.
