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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.
Poblano peppers. Paula Thomas / Getty Images. Poblano peppers (pronounced po-BLAH-no) are a mild variety of chili pepper used in Mexican and Southwestern cooking, perhaps most notably in the classic chile relleno in which the roasted pepper is stuffed with cheese, then coated in egg and fried.aula Thomas / Getty Images. Poblano peppers (pronounced po-BLAH-no) are a mild variety of chili pepper used in Mexican and Southwestern cooking, perhaps most notably in the classic chile relleno in which the roasted pepper is stuffed with cheese, then coated in egg and fried.