This week our chef challenge is a bit different. Usually we select one seasonal ingredient in which Rick and the guest chef create a meal around in 15 minutes. This week we are on location at Chicago's Green City Market. Sarah Stegner, of Prairie Grass Cafe in Northbrook, Illinois, first joins Rick to each search for 5 ingredients at the market to make something special. Then they both head back to the test kitchen to work their magic. And let me tell you, those dishes were delicious!