Colonche

the fruit tip of the prickly pear cactus

Colonche is an alcoholic red coloured drink from Mexico prepared with tuna, the fruits of "nopal" , especially with tuna cardona, the fruits of Opuntia streptacantha. It is prepared in the states where wild nopal is abundant (Aguascalientes, San Luis Potosi and Zacatecas). It is a sweet, fizzy beverage. For preparation, the cactus fruits are peeled and crushed to obtain the juice, which is boiled for 2–3 hours. After cooling, the juice is allowed to ferment for a few days. Sometimes old colonche is added as a starter. Another possible starter is "tibicos". Tibicos are gelatinous masses of yeasts and bacteria, grown in water with brown sugar.

Source: Wikipedia