Just to establish some credentials, this is my best-selling contribution to the drink list at the restaurant where I work. The others will be revealed later.
1 1/2 oz bourbon (a good spicy bourbon is best, proof-strength even better)
1 oz red vermouth (I like a good bittersweet version, say Cinzano Rosso or Punt e Mes)
3/4-1 oz green Chartreuse (I prefer more to less, but I like the stuff; if it's too much for you, the yellow version is an acceptable substitute)
Stir and strain into a chilled cocktail glass. Garnish with a lemon twist.
I just love this drink. It's dark, old-school, and wonderfully layered. The idea was sparked by a conversation about the equally lovely Tipperary Cocktail, but the name is derived from one of my favorites, the Widow's Kiss. This version is somewhat more... intense.