Today on Food Talk on WOR radio, Rocco DiSpirito and his guest - Tasmin Day Lewis (Daniel Day Lewis's sister) were talking about mastering recipes. They said that you should never make anything exactly the same way each time. Doing that would take all the fun and creativity out of being a cook. They also said that it was impossible to make a recipe identically each time. There are too many variables, from freshness of ingedients, to humidity, to quality.