Lone Star Taco Bar (Allston, Mass.) • Deep Ellum (Allston, Mass.) • Cafe Polonia (South Boston, Mass.).This trip, Guy's parking the Camaro in Beantown for an all-Boston smorgasbord. Just outside the city in the Allston suburbs, two restaurants sharin' one kitchen cookin’ up totally different menus: Mexican street food on one side and gastropub standouts, like killer gravlax and dynamite chicken sausage on the other. Then in the Polish Triangle in South Boston, Guy’s joined by Anthony Shriver, founder of Best Buddies International, and former NFL player Dan Koppen at an authentic old-country spot dishin’ out righteous pierogi and a fried pork favorite.