Fill a hurricane glass generously with crushed ice.
Add the spiced rum directly into the glass.
Pour in the cream of coconut and stir briefly to distribute.
Add the orange juice, then pour the pineapple juice over the top - it should be the dominant juice.
Slowly drizzle the grenadine down the inside edge of the glass so it sinks and creates a layered sunset effect.
Garnish with a fresh pineapple wedge on the rim and serve immediately.
Stripping back to a single spirit lets the spiced rum's vanilla and cinnamon notes sing against the tropical juices rather than getting lost in a three-spirit muddle. For a cleaner sunset effect, chill the grenadine before drizzling - it sinks more slowly and produces a sharper gradient.
My Bar Shelf reads your shelf and shows you every cocktail you can make from what you already own, including Arizona Twister.