Peinirli me Loukaniko is the boat built around sausage. The yeasted, canoe-shaped dough stays exactly what it is across the whole family; here the well is loaded with loukaniko, Greek sausage, sliced or split into the trough and baked open-faced under or alongside melting cheese. Sausage brings what minced meat and plain cheese do not: rendered fat, a defined spice profile, and snap from the casing. The bread soaks a little of that fat as it bakes, which is the point, and the cheese ties the coins of sausage to the crisp rim.
Build order matters because sausage carries a lot of fat and needs heat to render it. The loukaniko is sliced into rounds or split lengthwise and is usually given a head start, either pre-seared or laid in early, so it cooks through and gives up its fat rather than sitting greasy and pale on top. It is set into the cheese-filled boat, and the whole thing bakes in a hot oven until the rim is deep gold and crisp, the cheese bubbling, and the sausage edges browned and a little caramelized. Good execution is a firm hull that has taken just enough rendered fat to be flavorful without going soft, sausage with browned edges and a snap, and cheese that holds the two together. Sloppy execution is raw or flabby sausage that never rendered, a hull drowned in pooled grease, or pieces so large they steam instead of brown.
From there it shifts by sausage and by company. The loukaniko itself ranges by region and seasoning, from orange-and-fennel scented to leek-forward, and the boat changes character with it; that range deserves its own article rather than being crowded in here. Some kitchens add an egg over the sausage, some scatter extra cheese or pepper. The plain cheese boat, the egg version, and the ground-meat version are each distinct enough to stand on their own rather than be folded in. For peinirli me loukaniko, the constant is the rendered, browned sausage in a crisp boat, with the cheese as the binder and the hull kept just shy of greasy.