If you’re grilling or picnicking outside, it should be illegal not to have potato salad with your sandwiches or brisket or hot dogs or whatever.
Cutting into squares is totally optional.
I’m so sorry about the grilled cheese picture. Oh, wait—no I’m not.
All chop suey is American chop suey: Chop suey was (probably) invented in New York City in 1896. Oh well.