[brianpan]

> Butter is a key component of a quintessential American sandwich - the grilled cheese.

To YOU it is (and I agree with you). But people make it with oil or mayo as the fat. I doubt most people think of butter as a required ingredient.

[msrenee]

I didn't find out you could make a grilled cheese with mayo until a few years ago. My husband still won't even try it. In my region, I doubt that most people would be comfortable using mayo instead of butter.

[thaumasiotes]

I would have thought "the fat" in a grilled cheese sandwich would be mostly what's contained in the cheese.

[bregma]

The cheese is on the inside. You butter the outside of the sandwich when making grilled cheese.