If you've eaten at McDonald's in the last 50 years, chances are, you've eaten a Big Mac.
Beloved by fast-food burger enthusiasts, the Big Mac has long held a secret recipe which is the key to it's mouth-watering success.
What's in the secret sauce?
Much like the Colonel's 11 secret herbs and spices, or the burger bun recipe at Hungry Jack's; many have tried to decode the tangy recipe of the Big Mac sauce - and failed.
Fear not, burger lovers! To celebrate 50 years of Big Macs on the menu, McDonald's is giving you the opportunity to take home the special Big Mac sauce. For a limited time, you'll be able to buy the bottled deliciousness at selected Maccas restaurants for $12 a bottle. All sales proceeds will go to Ronald McDonald House Charity. There's only 100,000 bottles nationwide, so what are you waiting for? Run! Don't Walk!
Which fast-food outlet can't you resist?
My local fish and chip shop
Other - tell us in the comments section below!