Picture: Michael Wilson

One of the world's most expensive foods is expected to draw up to 30,000 foodies to the Perth Hills at the weekend.

And some of Perth's finest chefs are busy preparing for the fungi onslaught at the Mundaring Truffle Festival.

With the Wine and Truffle Company in Manjimup producing the biggest harvest of French black truffles in the southern hemisphere, the "black gold" is putting WA on the culinary map.

"From yachts in Tahiti, restaurants in Monaco, Germany, Japan and Italy, to Michelin-star chefs in New York, Manjimup truffles are on the menu," Wine and Truffle Company chief executive Alan Nelson said.

RECIPE: Perfect Scrambled Eggs with Truffle

"We are able to harvest the truffles, courier them to Perth, pack them and put them on a plane and have them in a restaurant overseas within two days."

The company is on target to harvest 1.45 tonnes of black truffles this year with premium grades selling for up to $3000kg.

Last year's MasterChef runner-up Poh Ling Yeow will be part of a master class featuring local chefs Alain Fabregues, Hadleigh Troy and Emmanuel Mollois.