A Chocolate Manhattan Is The Perfect Way To Enhance The Classic Bourbon Cocktail - Tasting Table
Briefly

To make a chocolate Manhattan, simply swap the Angostura for chocolate bitters. A classic Manhattan combines 2:1 whiskey and sweet vermouth, plus two dashes of Angostura bitters.
The alcohol content in bourbon complements chocolate's aromatic qualities, creating a smooth sip with shared compounds like vanillin and tannins. Chocolate bitters contribute dessert-like depth to the cocktail.
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