*Donn’s mix: Bring 3 crushed cinnamon sticks, 1 cup sugar and 1 cup water to a boil, stirring until the sugar is dissolved. Simmer for 2 minutes, then remove from the heat and let sit for at least 2 hours before straining into a clean glass bottle. To finish the mix, add 1 part of the syrup to 2 parts fresh grapefruit juice. Cover and keep refrigerated for up to 2 weeks.