The dish that most people in America know as potato casserole is referred to by Mormons as “funeral potatoes.” Because it’s customary for Mormons to serve this potato dish at funerals. The logic, I suppose, is that it’s comfort food. Wikipedia says that the typical ingredients of funeral potatoes are: “hash browns or cubed potatoes, cheese (cheddar or Parmesan), onions, cream soup (chicken, mushroom, or celery) or a cream sauce, sour cream, and is topped with butter and corn flakes or crushed potato chips.”
Funeral potatoes are one of a number of foods specifically associated with funerals in some cultures. Another example, previously mentioned here on WU, is Yorkshire Funeral Biscuits. And the Amish have a dish they call Funeral Pie, which is a raisin pie.