First, make your rich simple syrup. Instead of using white sugar to make the simple syrup, we’re using demerara sugar like Florida Crystals. Demerara sugar is not refined so it has a creamy, rich, bold flavor with a hint of molasses. Combine 2 cups of demerara sugar in a saucepan with 1 cup of water and simmer on stove until sugar has dissolved. Let cool completely and store in the refrigerator for up to 2 weeks.
To build your cocktail, add mint, lime, and simple syrup to a cocktail shaker and then muddle. Next, add your rum, then give it a quick shake and dump into your desired serving vessel. I recommend using a tall highball glass, pilsner glass, or even a tiki mug. Press the mint into the bottom of your glass and fill the glass with crushed ice. Use a bars spoon or a swizzle stick to swizzle the drink. You can do this by gently twirling the spoon or stick between the palms of your hands until a frost forms on the outside of the glass.
Add 2-4 dashes of Angostura bitters and top with additional ice. Garnish with a generous bouquet of mint. Finally, sip and enjoy!