McDonald’s is selling a bottle of the special sauce used on their iconic Big Mac burgers on eBay, which has attracted a bid for more than $17,000.

The 500 ml ‘Limited Edition Big Mac Special Sauce Bottle #1 of 200’ is being auctioned on eBay Australia with all proceeds going to charities run by the global chain to help sick children and their families.

MCDONALD’S JAPAN CHARGES $10 FOR TRUFFLE BURGER

McDonald’s said the special sauce was one of the company’s most iconic ingredients, and customers often ask where they could buy it.

The auction for the sauce, whose ingredients include relish, mustard, distilled vinegar, onion, garlic and salted egg yolks, will run until Feb 11.

Australian customers of McDonald’s will also be able to buy 25ml tubs of special sauce at restaurants around the country in February.

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McDonald’s is the world’s largest burger chain, with 36,000 outlets in more than 100 countries, but changing consumer tastes are proving a challenge as are agile new fast-food chains, compounded by a slump in sales in China and Japan after a scare over food safety.