Overview: JT Farnham's Seafood & Grill (South Essex, Mass.) • Joe's Gizzard City (Potterville, Mich.) • Grubstake Diner (San Francisco, Calif.) • Los Tapatios (San Jose, Calif.) Belly clams in Massachusetts, chicken gizzards in Michigan, Mexican food from a lunch truck, and Portuguese food in San Francisco. Guy travels to these locations this week for some one-of-a-kind specialties.