Sales are beefing up at better burger restaurants

Chains such as Five Guys Burgers and Fries, which offers hand-formed burgers and fresh-cut fries, are among the fastest growing in America.

The humble burger still reigns as America's favorite food, but a growing number of foodies are searching for something a little more special: Sandwiches made with fresh Angus beef, a better quality roll and such toppings as aged cheddar or homemade pickles.

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