A large, colorful storefront near the Tufts University campus, Tu y Yo specializes in authentic Mexican food in a style that dates to the 16th century. Settlers lived and ate at fondas, or boarding houses, that served home-style cooking. They ate well, too -- I've never had a disappointing meal here. The menu looks short, but many dishes are available with a choice of beef, chicken, pork, sausage, shrimp, or fish, and in vegetarian versions. To start, try sopes (fried disks of masa, or corn flour) topped with beans, cheese, and onions, or stuffed tortillas known as gringas. Many main-course descriptions include the dish's date and place of origin (owner Epi Guzman's family figures prominently), but even the options that have no pedigree are delicious. I especially like sausage or shrimp Alambre (with shredded cheese, onions, and peppers), which the diner scoops into a tortilla, and spinach a la Carlos (with potatoes in a garlic sauce). For the full experience, try one of the three versions of sangria, and finish with cinnamon-infused coffee and unbelievable flan.