La Quintinye Vermouth Royal Rouge

Absolutely sublime

The Pineau des Charentes base gives this a woody depth that is unique among vermouths that I've tried, as is the complexity of the fruit bouquet. For my taste, this is a bit too sweet (like Pineau des Charentes itself) and lacks in up-front bitterness* to be good as an aperitif, but it's delicious as a dessert wine and in cocktails -- I can't imagine a better pairing with bourbon in a Manhattan. For any use of sweet vermouth where the focus is on the fruit dimension more than the bittering agents, you'd be hard-pressed to top this.

*although, as "The Chaps" say, it does have a nice, herbal, lingering bitterness