The panino con lucanica is a Basilicata sausage sandwich, and the seasoning is what marks it. Lucanica is the fresh pork sausage of Lucania, the old name for the region, ground and cased in a long thin coil and flavoured with fennel, coriander, and chilli. It is the southern member of a family that runs the length of Italy under different names, but the Basilicata version carries that particular spicing and a notable hit of heat. It is a fresh sausage, cooked rather than cured, so the sandwich is built around a grilled coil hot off the heat rather than around clean cured slices.
The craft is the grill and a roll that can take the fat and the heat. The lucanica is cooked through over flame or a hot pan until the casing crisps and the fat renders, then slit or coiled into the bread while it is still hot, because a fresh sausage that has cooled goes tight and loses the juice that makes it a sandwich. The roll is plain and sturdy, often pressed lightly onto the warm sausage so it absorbs some of the rendered fat and the chilli oil rather than fighting it. Little else is needed: the fennel, coriander, and chilli are already worked through the meat, so the most that belongs is a few grilled peppers or friarielli to cut the richness, never a sauce that would mask a sausage already loud with its own spice.
The variations turn mostly on heat and what greens sit beside it. There is the plain grilled build, the one with sweet or hot peppers, and the version pushed harder on chilli for those who want the fire forward. Luganega, the leaner, milder coiled cousin of the Lombard north, is the same family in a different region with a different hand on the spice, and like the other regional fresh sausages it follows its own logic and deserves its own article rather than being crowded in here.