An extremely large, dark brown mushroom that is simply the way full maturity of crimino, which in turn is a variation common cultivated white mushroom. the name "portobello" began to be used in the Decade of 1980 as a brilliant marketing ploy to popularize an unglamorous mushroom that often had to be eliminated because the producers could not sell them. the portobello mushroom, which can easily measure 6 inches in diameter, has a lid open and flat. Why is the oldest of the species, the gills of portobello are fully exposed, meaning that some of the mushroom moisture evaporated. the reduced moisture focuses and enriches the flavor and creates a dense, meaty texture. Portobellos can be found in gourmet markets and many supermarkets. Their stems are very wooded and should be removed (but except for soups, stocks, etc.). Can be used the caps coarsely chopped, as with most of the mushrooms, but the portobello is much more dramatic used all. It is particularly popular grilled and used in a sandwich or cut into thick slices for salad and a main course. See also mushroom.