Peel onions and garlic and dice them coarsely. Rinse meat and pat dry. Heat clarified butter in a roaster. Brown the meat in it. Add onions and garlic and fry.
Season with salt, pepper, paprika and cumin. Add bay leaf and tomato paste. Deglaze with 1/2 litre water and 250 ml beer. Bring everything to the boil and simmer for 1 1/4 hours. Clean, dab dry and slice the mushrooms.
Bring mushrooms and remaining beer to the boil and simmer for 30 minutes. Add mushrooms to the goulash. Cook pasta in boiling salted water according to package instructions. Pour pasta onto a sieve and drain.
Season beer goulash to taste again. Stir in sour cream. Arrange goulash and noodles on plates and serve sprinkled with parsley.