Final answer:
The four grapes authorized for the production of Peruvian Pisco are Quebranta, Torontel, Italia, and Negra Criolla. These grapes contribute to the unique character and cultural heritage of Pisco, a Peruvian brandy.
Step-by-step explanation:
The four grapes authorized for the production of Peruvian Pisco are Quebranta, Torontel, Italia, and Negra Criolla. Peruvian Pisco is a type of brandy that is distilled from specific varieties of grapes and is an important part of the country's cultural heritage. Historically, Peru has maintained a unique set of regulations and classifications for the production of Pisco, which differentiates it from other spirits. Among the grape varieties, Quebranta is often noted for its strong presence in Pisco production, being a non-aromatic grape, while Italia, Negra Criolla, and Torontel are aromatic varieties that bring their own distinct characteristics to the beverage. It is produced in designated areas of Peru, adhering to strict production methods to maintain the authenticity and quality of the spirit.