Scraping the inside of a Portobello mushroom is a matter of personal preference. The gills (the dark, feathery part underneath the cap) are edible and safe to eat. However, some people prefer to remove them for a few reasons: - Appearance: The gills can darken the dish and release a black liquid that might affect the appearance of your meal. - Texture: Removing the gills can result in a slightly cleaner texture. - Flavor: Some find the gills to have a slightly more earthy or muddy taste. To scrape out the gills, use a spoon to gently scrape them out from underneath the mushroom cap.