Chilaquiles are an incredibly comforting, quick and easy Mexican dish whose origins and name are believed to go back to the Aztecs. (In Náhuatl, the Aztec language, the name means “submerged in chile sauce.”) It was — and is — a great way to use up stale tortillas because they soften and absorb the flavor and color of the chiles. For chilaquiles rojos, guajillo chiles are used to add that familiar brick red color, as well as an earthiness that balances out the sweetness and acidity of the…