Proper stir fry technique calls for fast rotating or stirring of ingredients while cooking, inspiring the rounded, sloped sides of the wok. The shape is similar to a salad bowl, designed for easy tossing of vegetables. This shape is also practical for deep frying foods such as tempura. As the pan is wide at the top and narrow at the bottom, frying can be done with less oil than with a straight-sided pan. A modern and convenient alternative to the traditional carbon steel wok, this wok does not require seasoning and will never rust. It also has a flat bottom so that it may be used alone on a gas or electric burner.