Son of the soil Pedro Castillo promises a presidency for Peru

Next month's runoff election pits the 51-year-old teacher against the far-right daughter of the country's 90s autocrat

By law, any president of Peru must be born on Peruvian soil. But few of the country's past leaders know that soil like the frontrunning candidate in the current electoral race - the son of Andean peasant farmers, who grew up in poverty.

On a recent morning, Pedro Castillo wore a woollen poncho, sandals made from old car tyres and a traditional wide-brimmed straw hat as he tended to his cows on his farm in Chugur, a tiny hamlet seven hours' drive from the city of Cajamarca.