We prefer untreated shrimp, but if your shrimp are treated with salt or additives such as sodium tripolyphosphate, do not add the salt in step 1. The balanced flavor of Valentina, Cholula, or Tapatío hot sauce works best here. If using a spicier, vinegary hot sauce such as Tabasco, start with half the amount called for and adjust to your taste after mixing. Saltines are a traditional accompaniment, but tortilla chips or thick-cut potato chips are also good. Serve this dish as an appetizer or light meal.

Pork butt roast is often labeled Boston butt in the supermarket. If your jalapeño is shorter than 3 inches long, you may wish to use two. If fresh tomatillos are unavailable, substitute three (11-ounce) cans of tomatillos, drained, rinsed, and patted dry; broil as directed. Serve with white rice and/or warm corn tortillas.