Serrano is pronounced: suh rah noh. Serrano chiles typically tend to have thin skin. They don't need to be steamed or peeled before using, making it one of the easiest peppers to use for salsas. Serranos are a green color, but ripen to red, brown, orange, or yellow. Serrano peppers don't dry well, because they are very meaty. The serrano chili pepper can be up to 5 times hotter than the jalapeño.
The Serrano chile pepper rates between 8,000 and 23,000 Scoville heat units on the heat index scale.