炒 is a phono-semantic compound of the semantic 火, which is fire, and the phonetic 少, which is few or less.
Stir-frying aptly describes the technique of stirring and tossing ingredients with oil heated in a wok. The English term stir-fried was coined in the 1945 cookbookHow to Cook and Eat in Chinese, written by Buwei Yang Chao, who was one of the first physicians to practice Western medicine in China.