In-N-Out served up the best fast-food double cheeseburger for a low price, but White Castle's small but flavorful sliders were also a great value.

The double cheeseburger has become a fast food staple, from classic versions like the In-N-Out Double-Double to the newer double smash burger that seems to be everywhere these days. The origins of ...

7th Street Burger double cheeseburger.Erin McDowell/Business Insider There were no lettuce or tomato slices to cut through the rich, savory indulgence, but that only added to the burger's savory ...