See how to turn sweet summer fruit into amazing shortbread treats. In this video, Chef John reveals his secret borderline-exotic spice ingredient. He also shows you how to cut first the butter into the flour and then the egg yolk into the flour and butter mixture. The shortbread comes out of the oven crisp and crumbly and the fresh blueberries are soft, sweet, and simply sensational. Check out Chef John's recipe for Blueberry Shortbread Bars. If you prefer, you can skip the blueberries and use sliced peaches, apricots, blackberries, or other ripe summer fruits instead.