Cayenne pepper is a hot chili pepper used to flavor dishes. It is red, long and thin, and has a slight curve.
Allergic reactions occur immediately or a few hours after exposure and may result from consuming even a small amount of cayenne pepper. If you start to experience an allergic reaction after ingesting cayenne pepper, contact your allergist (Livestrong, 2013).
Cayenne is a popular spice in a variety of cuisines. It is employed variously in its fresh form, dried and powdered, and as dried flakes. It is also a key ingredient in a variety of hot sauces, particularly those employing vinegar as a preservative. Cayenne pepper is often spread on sandwiches or similar items to add a spicy flavor. Buffalo wing sauce often contains cayenne (Wikipedia, nd).
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If you can handle the heat, here are some recipes using cayenne pepper.