McDonald's is changing the formula for all of its burgers, including the Big Mac, which is about as big as it gets in the world of fast food news.

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They assert that all the alterations will only improve their burgers, therefore customers should be happy. So, it begs the question.  What exactly are they changing?

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Here's what they're doing:

1.  The Big Mac is getting more Big Mac sauce.  A writer for People magazine tried it.  She says it makes it more like a "messy pub burger" than a quote, "run-of-the-mill drive-thru" thing.

2. The buns are changing too. They'll be softer than before. McDonald's describes them as "pillowy buns that are freshly toasted to a golden brown."

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3. The cheese will be meltier. It's not clear if they're changing the type of cheese, or just melting it more.

4. The onions are also changing. Instead of tossing them on at the end, they'll add them to burgers on the grill to create a more "caramelized flavor."

5. The changes don't just apply to Big Macs. They also apply to regular hamburgers, cheeseburgers, double cheeseburgers, and McDoubles. So they're revamping a big chunk of their core burger menu.

The new burgers are already being rolled out in a few West Coast cities, including Denver, Seattle, Phoenix, Las Vegas, and L.A. They'll be everywhere else by early next year.

6. They're also using it as a chance to bring back the Hamburglar. They posted two 15-second ads where he scopes out the new burgers through binoculars, and then steals them.

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