The Great Food Truck Race

The seven remaining teams roll into Flagstaff, Ariz., determined to get the hang of the food truck game. Just when things start to settle down, Tyler springs a Truck Stop cooking challenge on them: Create a dish featuring the local delicacy prickly pear cactus. Celebrity Chef Beau MacMillan judges the dishes and delivers a game-changing prize -- but Tyler is not done. On Sunday, he tells the teams to go vegan, and the teams scramble again to stay above water.