World's Top Fast-Food Restaurants

Frontera Fresco, several U.S. outlets

The Chef: Rick Bayless is often credited with introducing Americans to more refined south-of-the-border cooking at his Chicago restaurants Frontera Grill and Topolobampo (a favorite of the Obamas).

Fast Food 411: Ablaze in poppy colors, Frontera Fresco specializes in gringo-friendly Mexican street food: tortas, tacos, huaraches, small-batch salsas, and Mexican beer.

Where to Find It: Macy’s in Chicago; San Francisco; Costa Mesa, CA; Skokie, IL.

What to Order: Sweet corn and green chile tamale; chorizo quesadilla; mango limeade.