Not all food that gets cooked on a pizza needs a fridge. But either way you’re skipping the point. it’s literally leftovers combined, with or without a fridge. Probably even more so without a fridge if food goes bad faster.

The point is it’s a peasant food made of literally anything because scarcity.

So in all fairness to to the benefit it provides there should be no rule that there has to be a pineapple or not.

I am pretty sure the woman in the comic is the self-insert of the creator and they think it is funny that people have an extreme reaction to the author's minor infraction and that you should let people live their lives.

The joke is that eating pizza backwards is one step too far.