Challengers hit the toughest venue of all: L.A., where food trucks began.

Seven teams roll into Flagstaff, AZ, and face a prickly-pear challenge.

The teams are welcomed to Amarillo, TX, at the stadium of the Amarillo Sox.

The teams roll into Fayetteville, AR, a college town filled with teenagers.

In Nashville, the teams make a down-home picnic for musicians Joey and Rory.

The Cleveland challenge: create a delectable appetizer from an Ohio tomato.

In New England, the teams get sent to tiny Lubec, Maine, to do business.