That... Really depends on the cookbook. I'd be very surprised if the authors of some of the more popular "celebrity chef" books had actually cooked all of the r

That... Really depends on the cookbook. I'd be very surprised if the authors of some of the more popular "celebrity chef" books had actually cooked all of the recipes in their own books. The books are often anthologies of recipes found from other sources. I've definitely encountered recipes in his that were impossible to perform the way they were written.