Made this with Taylor's 10 Year Old this evening. It's a nice drink. It looks good (mine was more amber than the picture above) and tastes like you would expect a port/dry vermouth drink to taste. To my mind at least, cocktails are normally spirit based, so this is pleasantly different. I could quite happily follow it up with a second.
Jack's comment was made about Hugo Ensslin’s 1917 Devil’s Cocktail, which was originally on this page. Due to duplication, in March 2024, I repurposed this page to show Robert Vermeire’s 1922 Devil’s Cocktail. For Ensslin's Devil's Cocktail, please see the 'variant' link above.