White button mushrooms, are a common grassland fungi grown throughout the world and known by many names, including portobello, cremini, and champignon. However, white buttons have a distinctly pearl white cap.
Fresh mushrooms are dry and firm to the touch. Slimy and blotchy shrooms have gone too far. Refrigerate in a paper bag. A crisper is too moist. Do not wash until ready to eat.
If you brush them, do so carefully. Otherwise, they can be rinsed in a bowl. Trim longer stems before use. Eaten raw, the flavor is mild. Cooking awakens the fragrance. Try skewering or sautéing with butter. They make a creamy sauce for topping on chicken or steak!