Korea Fried Rice Cake

The food you're referring to is likely called "Tteokbokki" in Korean, which is a popular Korean street food and can also be found in some Korean restaurants in the USA. Tteokbokki is made with cylinder-shaped rice cakes (tteok) that are stir-fried with a spicy-sweet sauce made from gochujang (Korean red pepper paste), sugar, and other seasonings. It is often garnished with sesame seeds and/or scallions. Sometimes, it is served with fish cakes or boiled eggs. Tteokbokki has a chewy texture and a spicy, sweet, and savory flavor. Some restaurants in the USA might call it "Korean fried rice cake" due to its chewy texture and the fact that it is fried in a pan with the sauce.