Since 2005, Vigil's group has helped several dozen families in the impoverished regions of Apurimac and Ayacucho get started in the guinea pig business. One of the first things the organization must do, Vigil says, is help a family establish credit and take out a loan to buy a few breeder guinea pigs, which may run about $10 apiece. World Neighbors' on-site staff helps the farmers install basic guinea pig infrastructure, like cages and feeding troughs.
Sold to restaurants, each of the rodents pulls in about 15 Peruvian soles (the equivalent of almost $5) for the farmer, according to Vigil. He says no one he knows is getting rich in the guinea pig trade. However, some are doing quite well. The animals breed prolifically, and one particular farmer who bought two guinea pigs a year ago now has 400, Vigil says.
Heifer International, based in Little Rock, Ark., is independently running a similar program geared toward improving people's quality of life. Since 2000, the nonprofit's Peruvian program has donated 23,000 guinea pigs to 2,300 families, according to Jason Woods, Heifer International's senior communications director.
The animals are usually kept in barns outside the home. Many are fed a blend of mealtime leftovers and alfalfa grass. Since they convert plant matter into body mass about twice as efficiently as cows, guinea pigs are cheap to grow.
Guinea pig ranching "is a very good way to raise livestock, improve nutrition and make some money," Woods says.
Guinea pigs are slaughtered and sold at the tender age of about two months. At this point, each cuy is gutted and its hair removed after a dunk in boiling water. The idea is to leave the delicious skin intact.
"When guinea pigs are fried in pieces like chicken, the skin becomes crispy, which is most appealing to consumers," Vigil says, describing the more traditional approach to dining on guinea pig.
In upscale Lima restaurants, such as El Rocoto or Panchita, chefs have fancier tricks up their sleeves. One, Vigil says, is to make "guinea pig rolls" by removing the bones and wrapping vegetables and guinea pig meat together within the skin.
"Of course, the head and the claws are also removed in those restaurants in Lima, but in the Andes restaurants and in traditional restaurants in Ayacucho and Apurimac, the guinea pigs are served with the head and paws," he says.
Another typical dish is chiriuchu, a specialty of the Cuzco area.
"It combines all kinds of food — guinea pig, chicken, beef, fish, cheese and vegetables," says Woods, who has traveled in the region while working with Heifer International. "It basically looks like a big pile of meat."
Woods says guinea pig consumption, once mainly limited to households, is exploding in Peru's restaurants. Some, called cuyerias, actually specialize in cooking and serving guinea pig. Sol Moqueguano, for example, was launched 17 years ago in Cuzco.
"The owner told me that when he started, there weren't any restaurants that sold cuy in Cuzco," Woods says. At the time, Woods says, cuy was served mainly for weddings, anniversaries and other special celebrations.
That's changed dramatically. Sol Moqueguano now runs through 1,400 guinea pigs per week. And Woods says other cuyerias are now running similar operations in the same city.
While South Americans revisit old traditions of dining on cuy, interest in other countries is minimal, rooted mainly in small populations of Andean ex-pats, Vigil says. One United States importer based in Connecticut is importing about two tons of frozen guinea pigs into the United States each month, mostly at the demand of immigrants from Ecuador, Peru and Bolivia, according to Vigil.
But he doubts the guinea pig as a kitchen staple will ever go mainstream in the United States.
"It will never catch on with Caucasian Americans," he says. "They see guinea pigs as pets, not food. This is not something the culture of the U.S. will accept."
Alastair Bland is a freelance writer based in San Francisco who covers food, agriculture and the environment.
Copyright 2016 NPR.