Orange-Basil Cooler

In a 1-quart glass measure or bowl, combine basil leaves (see notes) and sugar. With a wooden spoon, crush leaves with the sugar until thoroughly bruised. Add orange juice and mix. Pour through a fine wire strainer into two ice-filled glasses (at least 10- to 12-oz. size). Add soda water to each glass and mix. Garnish coolers with rinsed sprigs of fresh basil.