Not the same yeast is used for all recipes: in some cases, in fact, it is not possible to choose natural yeast instead of chemical yeast. What will be the reason for this impossibility, dear friends and dear friends of cooking recipes? Well, the answer is simple: some preparations need to rise directly inside the oven during cooking - making the use of chemical yeast mandatory - while others must rise before cooking, requiring natural yeast instead. Baking yeast is generally chemical and is also called baking.