Add the aged rum, white rum, OJ and tart cherry juice to the shaker, along with simple syrup (if using).
Add ice, then seal the shaker and shake hard for about 20-30 seconds.
Strain over fresh ice in a 16oz-20oz glass, then top with a half can of passionfruit-flavored La Croix.
Garnish with an orange wedge and cocktail cherry.
Notes
*For a more cost-effective option, try using tart cherry concentrate (reduce amount accordingly).**If you would like a sweeter cocktail, you can make a basic simple syrup by combine sugar and hot water in a 1:1 ratio, then cooling to room temperature. Store leftover simple syrup in the fridge.