Combine the Rums: In a large pitcher, combine the light and dark rum. Stir well to mix them together.

Add the Juices: Pour in the pineapple juice, orange juice, and lime juice. Stir again until all the juices are well incorporated with the rum.

Sweeten with Grenadine: Add the grenadine to the pitcher. This gives the punch its lovely red hue and adds a touch of sweetness.

Mix It Up: Stir the mixture thoroughly until all the ingredients are well-blended.

Add Bitters: If you like a bit of complexity, add a few dashes of Angostura bitters. Stir again.

Serve Over Ice: Fill glasses with ice cubes and pour the punch over the top.

Garnish: Add slices of fresh fruit and a sprig of mint to each glass for a decorative and flavorful touch.