Follow the steps in order for the best result.
Begin by filling a Hurricane glass, or any tall glass, generously with ice.
Introduce the white rum and dark rum into the glass.
Carefully pour equal parts of pineapple juice, orange juice, and grapefruit juice into the mixture. For a balanced flavor, consider using equal amounts of orange and grapefruit juice with just a splash of pineapple juice, ensuring all juices are unsweetened.
Gently layer the Amaretto on top of the drink.
Add a splash of grenadine if desired.
Complete the presentation with an orange slice garnish.