Combine the simple syrup and Angostura bitters in a mixing glass, stirring gently to blend.

Pour in the banana peel rum and fill the mixing glass with ice.

Stir the mixture for 20–30 seconds to chill and achieve the ideal dilution.

Strain the cocktail into a rocks glass over a large ice cube.

Twist an orange peel over the drink to release its aromatic oils, then drop it into the glass for an enhanced flavor profile.