To impart "wok hei" the traditional way, the food is cooked in a seasoned wok over a high flame while being stirred and tossed quickly. Constant contact with the heat source is crucial as the addition of new ingredients and each toss of the wok inevitably cools the wok down; therefore, cooking over flame is preferred. Consequently, many chefs (especially those with less-than-ideal cookers) may cook in small batches to overcome this problem so that the wok is still as hot as it can be and to avoid "stewing" the food, instead. When cooking over gas stoves or open flame, it additionally allows for the splattering of fine oil particles to catch the flame into the wok; this is easily achieved when experienced chefs toss the wok and can be a demonstration of experience. For these reasons, cooking over an open flame is preferable to other types of stoves. Cooking with coated woks (e.g. nonstick) notably will not give the distinct taste of" wok hei", which is partially imbued from previous cooking sessions. In practical terms, the flavour imparted by chemical compounds results from caramelization, Maillard reactions, and the partial combustion of oil that come from charring and searing of the food at very high heat in excess of . Aside from flavour, the texture of the cooked items and smell involved also describe "wok hei".