Foragers find more than a Big Apple

It's a Sunday afternoon and about 30 new recruits are peering at the ground and shaking trees under the watchful eye of Steve Brill, known as "the wildman", who has been exploring Central Park's flora for the past 20 years.

"I prefer to eat local produce," explains the young man as he pulls up a handful of dandelions to take home for dinner. Just behind him, the skyscrapers of midtown Manhattan cast their long shadows.

"We're hunting for wild food that's been used for a thousand years, that's been here, hidden and very delicious," says the bearded guide, sporting an explorer's hat on one of his regular guided tours.