2 cups dark rum
1 cup pineapple juice
1 cup orange juice
1/2 cup lime juice
1/2 cup grenadine
2 to 4 tablespoons simple syrup, optional
Ice
Orange slices, for garnish
Lime slices, for garnish
Combine the rum, pineapple juice, orange juice, lime juice, and grenadine in a large pitcher
Add simple syrup if desired
Stir well
Fill glasses with ice
Pour the rum punch over the ice
Garnish with orange and lime slices