Watch: Top chefs turn food scraps into meals for the homeless

A documentary by Canadian filmmakers captures the behind-the-scenes images of an extraordinary soup kitchen that brought some of the world's top chefs to Milan last year in a mission to repurpose food scraps into healthy, delicious meals for the city's homeless.

Helmed by Italian chef Massimo Bottura, whose Modena restaurant Osteria Francescana was named the world's best restaurant 2016 by the UK-based Restaurant magazine, the project brought 60 celebrity and Michelin-starred chefs to Milan where they worked the humble kitchens of Refettorio Ambrosiano during Expo Milano 2015.