What is white castle horse meat?

White Castle is a fast-food chain that is famous for its miniature-sized hamburgers, also known as sliders. In the past, White Castle has used horse meat in its burgers due to its low cost and availability. However, the company stopped using horse meat in the 1940s due to consumer outcry and the rise of beef as a more popular meat alternative. Today, all White Castle burgers are made with 100% beef only. Despite the controversy surrounding it in the past, White Castle remains a popular fast-food chain that is well-known for its burgers and innovative marketing strategies.