Chilaca peppers are a mild to medium-hot, rich-flavored pepper that when dried, are known as a Pasilla pepper. The narrow chilaca can measure up to nine inches in length and often has a twisted or curvy shape. It turns from dark green to dark brown when fully mature. Just about the only place it can be found fresh in the United States is at farmer's markets and the occasional grocery store. It is a variety of Capsicum annuum. Pasilla (pronounced pah-SEE-yah; literally "little raisin") refers to more than one variety of chile in the species Capsicum annuum.
Chilaca pepper heat generally rates at 1,500 to 2,500 Scoville Units -- a mild to medium heat.