Pre-chill a coupe glass with ice water and set aside.
Add 45ml bourbon, 15ml triple sec, 15ml sweet vermouth, 15ml fresh lemon juice, 2.5ml rich sugar syrup, and 3 drops saline solution into a cocktail shaker.
Fill the shaker with ice and shake hard for 10–12 seconds.
Discard ice water from the coupe glass.
Fine strain the cocktail into the chilled coupe.
Express a lemon zest twist over the surface of the drink to release its oils, then lay it on top as a garnish.
Place a Luxardo maraschino cherry alongside or on a cocktail pick to finish.
The small measure of rich sugar syrup here is intentional - the triple sec and vermouth already contribute sweetness, so restraint avoids cloying the drink. Saline solution amplifies the citrus and rounds out the whiskey without any detectable saltiness.
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