Today McDonald's is giving away 10,000 bottles of it's secret sauce at select locations starting at 1:00. For years many have speculated that it's just Thousand Island dressing. In Metro Detroit you can score your free bottle in Royal Oak at the McDonald's on Woodward and 13 Mile.
It's unknown exactly how many bottles each location will have to give away. The promotion is in conjunction with the launch of the new Mac Jr. and Grand Mac. Get there early.
If you're not lucky to grab a bottle today, you can try making it at home.