Kettle corn is a sweet-and-salty variety of popcorn that is typically mixed or seasoned with a light-colored refined sugar, salt, and oil. It was traditionally made in cast iron kettles, hence the name, but in modern times other types of pots and pans are used.
 
History in the United States

Kettle corn was introduced to the United States in the 18th century. It is referenced in the diaries of Dutch settlers in Pennsylvania circa 1776.[citation needed] It was a treat sold at fairs or consumed at other festive occasions. The corn, oil, sugar, and salt are cooked together in a cast iron kettle, or possibly a Dutch oven. This produces a noticeable sweet crust on the popcorn; however, this method requires constant stirring or the sugar will burn. Alternatively, a batch of plain popped corn can be sweetened with sugar or honey before adding salt. This combination was widely popular in the early 19th century but fell from wide usage during the 20th century.