Chicano slang — firme, simón, órale, ese, ranfla — comes from Caló, a 1940s Pachuco code with Spanish, Romani and English roots. A field guide.

Pupusas are El Salvador's national dish — thick, handmade corn tortillas stuffed with cheese, beans, or pork, griddled until golden, and served with tangy curtido and salsa roja. Simple, cheap, and deeply satisfying, they've gone from Salvadoran street corners to viral food fame around...