A canonical coastal New England comfort food, "stuffies" are large clamshells packed with briny chopped quahog clams, smoky sausage, dried bread and aromatics, all baked until golden. Though a close cousin of clams casino and clams oreganata, this shoreline treat reflects influences unique to the region stretching from Cape Cod south to Rhode Island -- including a "make do" spirit of Yankee thrift and ingredients introduced by local Portuguese i…