giant puffball

"All members of the true puffball family are considered edible when immature, but can cause digestive upset if the spores have begun to form, as indicated by the color of the flesh being not pure white (first yellow, then brown). Immature gilled species still contained within their universal veil can be look alikes for puffballs.
The meat of giant puffballs tastes very similar to tofu or melted cheese when cooked." - Wikipedia.org