01 - Fill a large glass with crushed ice.
02 - Pour coconut-flavored syrup and fresh lime juice over the ice.
03 - Add the chilled cola or other dark soda to the glass.
04 - Gently stir to integrate the flavors.
05 - Slowly pour the half-and-half or heavy cream over the drink. Allow it to swirl for a marbled effect, then lightly stir to combine.
06 - Garnish with a lime wedge if desired. Serve immediately.