Orange Chicken Day, observed annually on July 15, celebrates the popular American Chinese dish known as orange chicken. This dish, which has its origins in tangerine chicken from Hunan province, was adapted by Chinese immigrants in the United States to better suit American tastes, resulting in a sweeter flavor profile. The most recognized version of orange chicken was reportedly developed in 1987 by Chef Andy Kao at a Panda Express in Hawaii, where it has since become a signature item, with the restaurant chain selling over 100 million pounds each year. The holiday was announced in September 2016 by the Twitter account @OrangeChixDay, and it has been celebrated since 2017. To mark the occasion, people often enjoy dining at their favorite Chinese restaurants or cooking orange chicken at home, often sharing their experiences on social media with hashtags like #OrangeChickenDay.