The pork tenderloin sandwich consists of a breaded and deep-fried pork cutlet that is usually served on a hamburger bun. Typical side dishes include french fries and onion rings, while the condiments of choice are usually mustard, lettuce, pickles, or mayonnaise.
The sandwich is popular throughout the Midwest, especially in the states of Indiana and Iowa. According to estimates, the sandwich is served in at least fifty percent of Indiana restaurants. The most popular theory suggests that the pork tenderloin sandwich originated in Huntington, Indiana, when Nicholas Freinstein opened a restaurant called Nick's Kitchen in 1908.