Wash the meat very well and remove fat.
Mix condiments and rinse it over the meat. Seal and put it to the fridge for 1/2 - 1h
Preheat the oven to 250 C
Add a bit of water so that the oil doesn't burn. Let it cook for 30 minutes at 250 C
Wash the mushrooms
And add them to the pan. Lower temperature to 200 C and cook it for another 30 minutes