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Serrano pepper. The serrano pepper (Capsicum annuum) is a type of chili pepper that originated in the mountainous regions of the Mexican states of Puebla and Hidalgo. The name of the pepper is a reference to the mountains (sierras) of these regions.
Jim Scherer / Getty Images. Serrano peppers are small to medium chili peppers with a fiery heat and sharp flavor. An extremely versatile and widely used chili pepper, serranos are similar in appearance to jalapenos, jalapeÃ±os but they are, smaller more slender and, pointed and quite a bit. spiciert is said that serrano chilis have a delayed fuse, which means that their heat takes a moment to fully kick in when it hits the palate. Serrano peppers register between 10,000 and 25,000 Scoville heat units on the Scoville Scale.