Sweet vermouth is a fortified, aromatized wine that’s sweetened and typically darker in color, often with caramelized richness plus botanicals like wormwood, herbs, and spices. It brings both sweetness and herbal complexity.
Compared with dry vermouth, it’s rounder, richer, and more dessert-spice leaning. In Manhattans and Negronis it provides the sweet-herbal counterweight that makes the drink feel complete.