At first glance of the interior or first bite of the food, you can usually tell whether or not you are dining at an "authentic" Mexican restaurant, or merely at one trying to cash in on the cuisine and culture. Diners at El Mariachi Loco in Manchester should have no problem quickly distinguishing from the bright, festive decor -- sombreros and Mexican folk art decorate the walls and tables, while the plastic tablecloths are as colorful as the most vibrant ponchos -- and the fiery, fresh breakfast, lunch, and dinner items that everything here is authentic, fresh and carefully prepared.