First make cinnamon syrup: Mix 1 cup sugar, 1 cup water, 3 crushed cinnamon sticks. Bring to a boil and simmer for 2 minutes or so. Let sit for at least 2 hours, possibly overnight. Store in refrigerator. To make Don’s mix, mix 1 part of this to 2 parts fresh grapefruit juice. [The idea is that the grapefruit juice will get nasty if stored, so make the cinnamon syrup, and mix in grapefruit fresh every time.]