Which component is found in the Lobster macaroni gratin?

Cavatappi pasta is the correct choice for the Lobster macaroni gratin because it is designed to hold onto sauces and other ingredients effectively. Its spiral shape and hollow core allow for better absorption of the creamy sauce typically found in gratins, enhancing the overall flavor and texture of the dish. Additionally, this pasta shape is often used in baked pasta dishes due to its ability to provide a sturdy structure that can withstand both cooking and holding onto the lobster meat, making it a popular choice for macaroni gratin recipes.

Other pasta types like fusilli, lasagna noodles, and spaghetti do not provide the same level of adhesion for cheese and sauce in a gratin context, making them less suitable for this specific dish.