Papa a la Huancaina

Named for Huancayo, the highland city in central Peru's Junín region, but invented on the coast — likely Lima — in the late 19th or early 20th century. One account credits women selling food to railway workers building the Lima-Huancayo line (completed 1908). The saltine cracker thickener gives it away as a post-1900 dish; before industrial crackers, the recipe used bread.

Named for highland Huancayo but invented on the coast — late-1800s Lima cooks feeding railway workers on the Lima-Huancayo line that finished in 1908. The saltine cracker dates the recipe: pre-1900 versions used bread.

Cold sliced yellow potatoes lying under a thick pale-orange sauce, served on a leaf of lettuce with a black olive and a wedge of hard-boiled egg. The sauce — aji amarillo, queso fresco, evaporated milk, saltines — should be smooth, pourable, and clingy enough to coat the potato evenly. First taste is creamy and faintly nutty, then the chili comes up at the back.

The cracker (or bread) is the emulsifier that holds aji amarillo's oil and the cheese's water in suspension — without it the sauce splits in the fridge. Queso fresco must be a fresh, slightly salty white cheese; feta is too sharp, ricotta too sweet. The potatoes are boiled in salted water and cooled fully before saucing — warm potato thins the sauce and turns the dish into a soup.