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A low-ABV highball of vermouth lengthened with tonic and citrus.
Vermouth Tonic pours fortified wine over ice and tops it with tonic. Blanc or dry vermouth stays crisp; sweet vermouth reads richer. It is a sessionable aperitif highball with far less strength than a spirit-forward cocktail.

“Vermouth-and-tonic highballs surged in Spain and modern aperitivo bars as drinkers sought lower-ABV daytime options.”
Blanc vermouth is the most crowd-pleasing. Keep tonic cold and not overly sweet.
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