A Serrano pepper
is a type of chile
pepper that originated in the mountainous regions of
the Mexican states of Puebla and Hidalgo. Unripe Serrano
are green, but the color at maturity varies. Common colors
are red, brown, orange, or yellow. Serrano are very meaty
and thus they do not dry very well. They are generally
between 1 and 2 inches long (2.5 to 5 cm) and around 1/2
inch (1 cm) wide.
Most Serrano rate
between 10,000 and 20,000 Scoville units.