Mate
traditional infusion from the yerba mate plant, from Paraguay, Guarani people.
Food
The travel guide lists 25 places to eat and drink in Asunción and Ciudad del Este. Local dishes to try: Mate, Sopa paraguaya, Vori vori, Chipa guasu, and Tereré.
Listed in the Wikivoyage travel guide. Opening hours and prices change, so check before you go.
corner Estrella and Alberdi
corner of Palma and Chile
Aviadores del Chaco c/ San Martín
Avenida Mariscal López 4049, near Avenida República Argentina
Palma between 14 de Mayo and 15 de Agosto
421 Palma, past Lido's and the hall of martyrs, near Burger King
corner of Eligio Ayala and Tacuary
Senador Long 1481
Sucre 1655
Cerro Corá 851
Independencia Nacional and Teniente Fariña
Ayolas and Benjamin Constant
Source and corrections: Wikivoyage guide to Asunción · CC BY-SA 4.0
Abay
Av. Pampliega
Av. Adrian Jara
Av. Carlos Antonio Lopez
Av. Carlos Antonio Lopez
C. 29 de Septiembre
Av. Carlos Antonio Lopez
C. Boqueron
Source and corrections: Wikivoyage guide to Ciudad del Este · CC BY-SA 4.0
Foods and drinks that come from Paraguay, the most widely known first.
traditional infusion from the yerba mate plant, from Paraguay, Guarani people.

traditional food from Paraguay and northeastern Argentina
fish soup typical of Paraguay

fried flat breads from Argentina, Paraguay and Uruguay

Paraguay is known for Mate, Sopa paraguaya, Vori vori, Chipa guasu, and Tereré.
The travel guide to Asunción lists El Bolsi, Lido Bar, Shangri-La, Acuarela, and Burger King.
Sources: Wikidata (CC0), Wikivoyage (CC BY-SA 4.0), photos from Wikimedia Commons.