Ají Amarillo is a yellow / orange pepper and is one of the most commonly used peppers in Peruvian cooking. The pepper originated in South America and has been used for thousands of years. Peppers such as this were one of the first spices used in Peruvian food. Ají peppers are used in a variety of sauces such as Ají Amarillo sauce. The peppers can be sold in jars or fresh from local markets.