fresh lime soda was "the supreme quencher of colonial thirst" in India. 2 tbsp. simple syrup (made by first boiling together equal parts sugar and water, then letting it cool) 1 1⁄2 tbsp. freshly squeezed lime juice (regular supermarket limes—a k a persian limes—are the best ones to use) 3⁄4 cup soda water Lime slice 1. Fill a glass with ice cubes, then add simple syrup and lime juice. Add soda water. Stir well, then serve garnished with a lime slice, if you like.