Final answer:
The special aspect of the sausage in Bangers and Mash is that it is a locally made English banger, with regional variations, and is served with a unique gravy.
Step-by-step explanation:
The sausage in Bangers and Mash is special because it is a locally made English banger. This traditional dish is known for its hearty and comforting qualities. The English banger is a type of sausage that typically contains a mix of pork, breadcrumbs, and spices. It may vary regionally, with some variations including different types of meat or seasonings. The local aspect of the sausage means it is fresh and supports local producers. Bangers and Mash is also served with a unique gravy, often onion or mushroom-based, which complements the flavors of the banger. The sausages are often served with mashed potatoes and a unique gravy, which complements the flavors of the bangers.