This cocktail is featured in Chapter 3 of Berry's book, in a section that details the colonial history of Trinidad, and in particular the fact that the Angostura company (of bitters fame) had a strong presence in Port-of-Spain in the early 20th century, after relocating from Venezuela. It's therefore fitting that this cocktail makes heavy use of Angostura bitters - a full four dashes. Here's the recipe:
1.50 oz. gold Trinidad rum (I used Plantation 3 Stars, a white rum, which is a blend of rums from Jamaica, Barbados, and Trinidad - perhaps not really correct being that it's not a gold rum ...)
0.50 oz. Italian vermouth
0.50 oz. fresh lime juice
0.50 oz. grenadine
4 dashes Angostura bitters
Shake with ice cubes. Strain into a cocktail glass (I ended up using a coupe instead of the glass pictured since the volume of this drink is fairly small).
The Angostura bitters figure heavily in this cocktail. I usually love the addition of Angostura for an added spicy/bitter note, but 4 dashes' worth seemed a little heavy handed to me. It made the cocktail veer off into medicinal/Robitussin territory, which for me is pretty hard to do. My first impression was a "medicinal-tasting daiquiri." I didn't dislike it enough that I didn't finish it, but this is not a cocktail I'd be rushing to make again. That being said, if your taste generally veers towards that type of flavor, by all means give this one a go. From the little knowledge and experience I have of early cocktails (say, from the 1890s - 1930s), I'm not altogether surprised that this drink is from that era, and of course being from Trinidad, they would be keen to feature Angostura bitters heavily in a locally created and served drink. So, it's definitely worth trying just to appreciate for where it came from and the history behind it.
I found this interesting short film produced in the 1930s as a sort of travelogue featuring Trinidad - it's got some great footage. Skip to 2:22 to see people checking out the "world famous Angostura bitters factory, invariably the first stop on a sight seeing tour!" Until next time - cheers!