The Glocal Book:"The Book of Tea" by Okakura Kakuzou(Tenshin)-No.16

Froth of the Liquid Jade

「By the fourth　and fifth centuries Tea became a favourite beverage among the inhabitants of the Yantage-Kiniang valley. Its was about this time that the modern ideograph Cha was coined, evidently a corruption of the classic Tou. The poets of the southen dynasties have left some fragments of their fervent adoration of the "froth of the liquid jade." Then emperors used to below some rare preparation of the leaves on their high ministers as a reward for eminent services.
Yet the method of drinking tea at this stage was primitive in the extreme. The leaves were streamed, crushed in a mortar, made into a cake, and boiled together with rice, ginger salt, orange peel, spices, milk, and sometimes with onions!
The custom obtains at the present day among the Thibetans and various Mongolian tribes, who make a curious syrup of these ingredients. The use of lemon slices by the Russians, who learned to take tea from the Chinese caravansaries, points to the survival of the ancient method.」 (From The Book of Tea-The School of Tea pp.22-23,Charles E. Tuttle Co., Rutland,Vermont-Tokyo,Japan)
From above descrived way of drinking Tea, you are able to mix any other foods which you like. Therefore, any nation could induce the tea into their country.
The facts might be the reasons why the tea spread over world wide.
In addition,its mean the drinks contain almost all kinds of nutritional components.
You will accept the idea that the tea have the glocal character.

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