A pedestrian walks by a Panera Bread restaurant on June 3 in San Francisco. Panera Bread is set to remove artificial colors, flavors, sweeteners and preservatives from items on its menu by the end of 2016. Justin Sullivan/Getty Images hide caption

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In-N-Out Burger has long been known for its secret menu, featuring options such as "animal style" fries, "3x3" burgers and Neapolitan milkshakes. istolethetv/Flickr hide caption

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