Not sure how some chefs just whip up recipes

I see on so many blogs and Web sites chefs especially those who are popular come up with random recipes. They can create something exotic sounding out of the simplest vegetable and ingredients. With some cheese in there I am sure anything can be created into an appetizing food item especially if that is accompanied by a great photograph. However appetizing it may sound or look, the taste is questionable unless these recipes have been tried and tested.