Cut off the dry part of the stem on mushrooms. Then cut into four pieces.
Pour the frying oil into the pan and add the mushrooms. Swirl the mushrooms on half heat, gently, until they shrink by half (the water evaporates) and the surface gets a nice colour.
Season with salt, black pepper and butter. Serve and garnish the fried mushrooms with a sprig of parsley.
Notes
Use a wide frying pan to avoid overcrowding.
Cook mushrooms in batches if necessary.
Allow them to sit undisturbed to develop colour.
Finish with butter, garlic or fresh herbs for extra flavour.