Jalapeño Peppers
Jalapeño Peppers is a fresh vegetable ingredient used for flavor, color, and texture. Prep it evenly, dry the surface when browning matters, and cook it only as far as the dish needs.
Identity
Fresh vegetable
Prep size and surface dryness shape texture.
Fresh vegetables cook more evenly when pieces are similar in size. Rinse well, dry the surface when browning matters, and add them at the point where their texture fits the dish.
Wikimedia Commons
Reference image
Jalapeño Peppers reference image.

Source: Wikimedia Commons
Substitutions
Acceptable
Serrano Pepper -> Jalapeño Peppers
2 Serrano or jalapeño peppers, roughly chopped, stems discarded
The source lists this as an alternative in the same ingredient row.