Make 2 cups simple syrup (recipe below), adding 4 cinnamon sticks before heating. Let cool, then pour into an ice-filled pitcher. Stir in 2 cups each fresh grapefruit juice and water and some raspberries.
Simple Syrup: To make 2 cups simple syrup, bring 1 1/2cups each sugar and water to a boil, stirring until dissolved. Let cool.
Photograph by Jonathan Kantor