Plot: After 13 grueling weeks of competition, the chefs must create the best four-course meal of their lives for their final challenge at Willamette Valley Vineyards. They’ll serve it to an esteemed table including Padma, Tom and Gail, this season’s All-Star dining panel, and a few additional noteworthy guests including Tiffany Derry, Peter Cho and Naomi Pomeroy