Beafsteak Fungus (Fistulina hepatica)
It is edible but I suspect it is not as tasty as a piece of rump steak - my book says "the flesh is dark and succulent, is mottled in appearance with pink veins that give out a blood like sap. It tastes sourish and has a pleasant smell". Try it if you dare!
What I found interesting is that this parasitic plant turns the wood of its host a dark drown (back to that blood like sap' I suppose) which makes it in much demand from the furniture industry. The poor tree! If the fungus doesn't get you the carpenter will