For a product to reach a specific internal temperature , the cooking apparatus must be set at a higher temperature than the target temperature. Evaporative cooling prevents the product from being the same temperature as the set point. Therefore , cooking temperature must be greater than the desired internal temperature. Boles and Swan (2002a) reported cooking time was faster when roasts were cooked at a constant temperature as compared with roast cooked by a step-up (maintain 10๐C differential between the internal temperature and the cooking temperature) or delta T process. This shown that cooking temperature does affect the rate of cooking. Bengtsson et al. (1976) reported that increasing the oven temperature from 175๐ to 225๐ C resulted in steeper temperature gradients , shorter cooking times, and lower yields.