Like round white balls of polystyrene
Round about a golf ball in size usually, they get up to the size of a small orange.
There are no toxic puffballs in the UK, but slice them open and have a looksee. If they aren't all white inside discard them.
They are kind of, well, I think of them like tofu, but HWMBLT says they're like egg white
Slice them up and either dry them to fry later (make mushroom crispy things
) or slice and fry in oil or butter and serve with herbs and seasoning.
The giant ones are rarer, though I have seen them in the woods along the motorway at Hamilton.
Birch Boletus should be about too just now, I'm sure someone was talking about them on BB.
cheers,
Toddy