Stir acid into syrup until dissolved. Add booze & ice. Stir, strain, rocks.
The Trader Joe's Hat Trick bitters were a 3-pack I found around X-mas 2016; rumor has it they were just a seasonal one-off. The "Spicy" flavor has strong coconutty-clove notes, and contribute greatly to the drink's profile. Sub the "cloviest" bitters you have if you can't find them.