I can't keep them in my head for long. Reason being, I mess with recipes a lot. Pretty much every time I make something, until I think it perfect, I change something. Also, my fam tends to eat the same stuff several times in a month, then not again for a couple months. If I don't write it down, by the time I come back to it after not making it for a while, I can never remember which change is where I landed as best.