12 oz. light rum
12 oz. dark rum
10 oz. grenadine or passion fruit syrup
10 oz. fresh orange juice
10 oz. sour mix or fresh lime juice
3 tbsp. superfine sugar or more to taste
1 large orange, cut into 1/4-inch thick slices

Mix all the ingredients in a tall pitcher or large pot and stir to dissolve the sugar. Pour into a punch bowl and add the ice cubes and orange segments. Serve in tall glasses over the rocks with straws.

Makes 10 to 12 servings.