Americans' passion for the burger remains strong and runs the gamut from the familiar ketchup, mustard, pickle and onion-topped thin patty to the hormone-free, grass-fed beef sandwich finished with smoked mayo and shaved truffles, said chefs who shared tips on building the perfect burger. "There’s no other food that we claim as passionately as the burger," said A.J. Benga, chef at RnR in Scottsdale, Ariz. "It's ours to love, and we’ve never loved them more than now."

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