What is a sport pepper?

A sport pepper is a small, hot variety of chili pepper that is commonly used as a condiment in Chicago-style hot dogs and other regional American dishes. The peppers are typically picked when they are green and measure approximately 1-2 inches in length. They have a medium-hot level of spiciness and are often pickled in vinegar or brine for added flavor and preservation. Sport peppers are also commonly used in Italian beef sandwiches and other sandwiches and salads for a spicy kick. They are believed to have originated in the Balkan region of Europe and were brought to the United States by immigrants in the late 19th century.