Monica and Louisa talk lemon cake and street food. Monica takes us on a quest to find the most delicious dumpling in the world in Shanghai. We also talk to food historians Colleen Sen and Bruce Kraig about their new book "Street Food: Everything You Need to Know About the Open-Air Stands, Carts & Food Trucks Across the Globe." Plus, Louisa brings in the famous Portillo's Lemon Cake Shake. Will We Eat It with WBEZ roof grown hot peppers or at all?