I've tried white port, tawny port and ruby port in this vintage cocktail. Tawny works best, with white port a close second, especially if a sweeter style...
Delightful combination of ingredients not usually found together. Hamilton Jamaican Pot-Still Black Rum gave the rum some prominence in this mix, but the Carvalhas Tawny contributed its share. Not sure sweet white port would work as well; this doesn't need extra sweetener. I added both orange and lemon twists.