What is the cold herbal tea paraguayans drink?

The cold herbal tea Paraguayans drink is called Tereré.

Explanation:

The cold herbal tea Paraguayans drink is called Tereré. Tereré is the official beverage of Paraguay and is considered part of its cultural heritage. Even though it's typical of Paraguay, it's also drank in the north of Argentina and in some parts of southern Brazil. Tereré is prepared in a vase called "mate", filled with herbs. It may also be filled with what is called "yerba mate". A bulb is placed in the mate in order to drink the beverage and it gets filled with cold water.

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