Is serrano a green pepper capitalized?

Yes, "Serrano" should be capitalized when referring to the specific type of pepper, as it is a proper noun. Serrano peppers are medium-sized, typically green peppers known for their heat and flavor, commonly used in Mexican cuisine. When discussing them in general terms, you might refer to them as "serrano peppers" but still capitalize "Serrano" as it denotes the specific variety.