A beautiful dark green almost black chile. Large and lucious the poblano is one of the most popular chiles used in Mexican cuisine. The typical chile is at least 4 to 5" long. In California these chiles are called pasilla. This is not a chile to eat raw but use it roasted, rajas (strips) sauces or stews. When dried the poblano is called an ancho or mulato chile.
Depending on where you live they may be a common grocery store item. Otherwise look for them in Mexican markets.