In a cocktail shaker, add the white rum (2 oz), dark rum (1 oz), fresh orange juice (2 oz), fresh pineapple juice (2 oz), fresh lime juice (0.5 oz) and grenadine (0.5 oz).

Add ice and shake

Fill the shaker with ice (enough to come halfway or a cup of crushed ice). Secure the lid and shake vigorously for about 10–15 seconds until the outside of the shaker feels cold and slightly frosted.

Serve

Fill a highball or tumbler glass with fresh crushed ice (about 1 cup). Strain the shaken cocktail over the ice, letting the grenadine trail to create a subtle layered color at the bottom.

Garnish with an orange wheel and a maraschino cherry on a pick. Add a fresh mint sprig if desired for aroma. Optionally float a small additional 0.25 oz of dark rum on top for visual effect and added depth.

Serve with a straw and stir briefly before drinking to integrate the grenadine if the guest prefers an even flavor.