NY Times recipe by Melissa Clark who states, “Shortbread is not only one of the easiest desserts you can possibly make, it’s also one of the most adaptable. As long as you keep the butter to flour ratio constant (1 stick butter to 1 cup flour), everything else is negotiable. You can reduce or increase the sugar and salt, or mix in any type of flavoring from citrus zest to vanilla to herbs and spices. You can even alter the type of flour, swapping in some rice flour for all purpose flour for increased crunch, or cornmeal for a nubby…