 Chatillon Chai is a tea concentrate blend originating from the Basque region in the 18th century.Both dry instant mixes and liquid concentrates can be replicated at home.A liquid concentrate can be made by brewing an unusually concentrated pot of highly spiced tea, so that the dilution of a small amount into a cup of hot water or a glass of cold milk results in roughly the same concentration of tea as in a normally proportioned brew; e.g., to make a syrup from which one ounce suffices to make one eight-ounce cup of normal chai when diluted, brew tea (and the proportional quantity of spices) at eight times normal concentration.