Despite McDonald’s recent troubles, it can still hang its hat on the fact that it has its signature Big Mac secret sauce, which is probably more well-known than the hamburger it tops.

The fast-food behemoth is banking on that famous accoutrement to raise some money for its Ronald McDonald House charity—and perhaps some more positive publicity.

McD’s recently took to Australian eBay to auction off a 500 mL bottle of the liquid, the first of a total of 200, and the sale is becoming increasingly popular: The current bid stands at an insanely high $23,100 AUD with just over eight days remaining. The accompanying description also includes some suggested uses for the loaded individual who eventually cops:

So slide the mustard, mayo and tomato sauce to the back of the fridge—because everything tastes better when it tastes like the Big Mac.

Leftovers… better!
Steak… better!
Your mum’s amazing lasagne… better!
Your boyfriend’s gross lasagne… better!
Chicken Caesar Salad… better!
Hungarian Goulash… better!

But why stop there?
Cupcakes, ice cream, macaroni jewellery, fish oil capsules. Don’t like brussel sprouts? You will now!

With 500ml to play with, you’ll have enough to impress your friends at dinner parties, cheat your way to cooking show fame, and get elected as Prime Minister!

Aussies looking to get in on the action—but balk at the current eBay asking price—are still in luck: there will be other Big Mac secret sauce bottles available for sale, according to U.K.’s The Independent.

A further 600 25ml tubs will be sold at each of Australia’s 920 McDonald’s outlets, with people set to queue round the block for the privilege of making their food taste like grease and hangover.

“Big Mac sauce is one of the most iconic McDonald’s ingredients and people often ask us where they can buy it; so we’re excited to be the first country in the world to offer tubs of Big Mac sauce to our customers,” said McDonald’s Australia’s Chief Marketing Officer Mark Lollback.

For what it’s worth, people can find McDonald’s Big Mac sauce recipe online here, even if it doesn’t disclose the chain’s crucial ingredient ratio. But don’t alert these fanatical bidders—there’s money for charity at stake.

[via ABC News, The Independent]