Combine the first 4 ingredients into smaller cocktail shaker with ice, and shake until properly mixed - about 10 secs.
Double-strain with a Hawthorne cocktail strainer and fine mesh strainer into a Hurricane glass or double rocks glass/Old Fashioned glass over fresh pebble ice.
Use your bar spoon to add the dark rum as a rum float across the top of the cocktail.
Garnish with fresh mint sprig, orange slice, cocktail cherry, and/or lime wedge.