Beefsteak Polypore/Poor Man's Steak/Ox Tongue. Just learned about it recently on this /c/.
Found a big one this time. It's supposed to be edible but doesn't sound to tasty and is supposed to be gathered young.
Btw I love the English names, the German ones are often times very scientific/descriptive but don't evoke images like the English ones (there are exceptions of course).
Sorry for the mediocre image quality.. I didn't get the focus right.
Nice find! Hard to tell from this picture how old it is, but I would encourage you to taste it! When I tried one it had great texture, and it's a bit sour (which personally I liked), but very strange for a mushroom.