Fresh Coconut works best, Harmless Harvest is a good alternative if you don't want to crack one open.
2oz fresh Coconut Water
1.5oz Tawny Port
.5 Banks 7 rum
barspoon vanilla syrup
half a lime
Squeeze half a lime into a tin and reserve the shell.
Add the rest of the ingredients along with 4oz of Scotsman ice and roll between two tins. Deposit drink into a snifter along with the spent lime shell and finish off with a generous amount of Angostura bitters on top.