What is the key ingredient in Porto's BBQ beef sandwich?

The key ingredient in Porto's BBQ beef sandwich is beef brisket. This cut of meat is known for its rich flavor and tenderness when slow-cooked, making it an ideal choice for BBQ sandwiches. Brisket, which comes from the lower front part of the cow, has a significant amount of connective tissue that breaks down during cooking, resulting in a juicy and flavorful sandwich. This aligns perfectly with the expectations of a BBQ sandwich, where the quality of the meat is crucial to the dish's overall taste and appeal.

The other options, while they are common meats used in various BBQ dishes, do not serve as the primary ingredient in this particular sandwich, highlighting the uniqueness of Porto's offering with its focus on beef brisket.