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Which part of yellow gentian is used to flavour herbal aperitifs?

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The root of the yellow gentian (Gentiana lutea) is the part of the plant used to flavor herbal aperitifs and bitters.12

While the plant is prized for its yellow flowers, it is specifically the rhizome and roots that are harvested for their use as a tonic, stomachic, and flavoring agent in beverages such as vermouth and various liqueurs.123