For the best flavor, use freshly squeezed lime juice. To make pineapple-infused rum, combine chunks of fresh pineapple with gold Barbados rum in an airtight container and let it infuse for 2-3 days in the refrigerator. Strain before using. If you don't have orgeat syrup, you can substitute with a small amount of simple syrup and a few drops of almond extract, but the flavor will not be quite the same. Adjust the sweetness to your preference by adding a touch more orgeat syrup or simple syrup, if desired.