It's particularly popular grilled and used in a sandwich, or cut into thick slices for a salad or entr e. Busy home cooks not only appreciate portobello's fabulous flavor and meaty texture, they love the versatility and easy preparation. Grilled or roasted, portable mushrooms can stand in for everything from T-bones to burgers. Quickly saut ed, they also lend their special touch to pastas, pizzas, salads, soups and many more family favorites. As they mature, the caps become flatter, their surface darkens and becomes slightly wrinkled. These mushrooms are still good to buy and use - in fact, their flavor will be richer and more intensely mushroomy.
Size varies, but that's no indicator of taste or texture.
Store in paper bags, never in plastic, which retains too much moisture. Or, if the portobello's are covered in plastic, remove it and wrap loosely with paper towels. Do not rinse mushrooms until ready to use. If the stems are attached, trim off the bottoms. There are also additional marinades or sauces you can make for basting.