A bit labor-intensive compared to my other delightfully simple and lazy muffin recipes...but the taste is worth it! Note that unless you add dye, these will not have the deep green appearance of storebought pistachio muffins-- since all those usually have dye in them, the green that naturally occurs from pistachios is a muted pastel green! Those raw shelled pistachios from Whole Foods are perfect for this. A food processor is required. Adjust baking time if making 12 regular size muffins, I prefer 6 Texas Muffins.