Lots of memories in the contributions above. Kids will eat almost anything, or they did when I was one.

Beans on toast is universal, not just British. We had it with a sausage on the side.
And I remember the spam with potatoes, sweet or otherwise.

Two from university.
A Salisbury steak (giant burger without bun), with a large scoop of baked beans and lots of Ketchup, toasted bun on the side. (Nighthawk in Austin).
Steak tartare, with mugs of dark beer (German place by the Gesangverein, Austin).
Loco moko- Two burger patties, two scoop rice, two scoop gravy, bun on the side. (Several places in Hawai'i).

One we do about once a month-
Two slices of supermarket 'dutch crunch' bread, containing fried thick-cut bacon, old Canadian cheddar, sliced tomato, a layer of each. The sandwich toasted in butter.