The dish is often topped with potato chips, corn flakes, breadcrumbs or canned fried onions.

[1] Casseroles became popular in American households in the 1950s mainly because the ingredients were cheap and easy to find at the supermarket.

Tuna casserole is popular to take to potlucks, and may be taken to the home of someone who is sick or going through bereavement as a gesture of kindness.

[2] Tonnikalavuoka or tonnikalapastavuoka, literally meaning "tuna pasta casserole", is a Finnish version of the dish.

[3] The primary ingredients are tuna and pasta, often with tomatoes and garlic included and shredded mozzarella sprinkled on top.