The only tonic that has the courage to be mixed with Duroc Gin. 🔥 Duroc Dry Tonic is made with natural China bark extract from South America! The perfect tonic to accompany your Gin Tonic, extremely dry to enhance the smoky notes of Duroc Gin. Duroc Gin is a gin made with the London Dry technique, designed to combine two apparently distant organoleptic characteristics: the fresh and citrus taste with the smoky scent.