Which sentence is not related to the main idea?

Aunt Lucy's chicken-n-rice casserole is a layered delight. (1) A layer of rice covers the bottom of the casserole dish. (2) Baked boneless chicken is placed on top of the bed of rice. (3) Hungarian goulash uses noodles instead of rice. (4) Next follows a layer of cream of mushroom soup. Topping off the dish is a thick layer of grated cheese.