Place a chopped lime half into a rocks glass and muddle
Fill the rocks glass to the top with crushed ice
Pour in 0.5 oz of watermelon syrup, 2 oz of cranberry juice and 0.75 oz of Campari
Add 2 oz of cinnamon liqueur and stir gently
Top up with crushed ice
Garnish with a grapefruit wedge and a cinnamon stick