2 tbsp. finely chopped fresh chives
1 tbsp. lemon juice
1/2 cup beef stock
1 cup sour cream
1 tbsp. paprika
200 g button mushrooms, thinly sliced
2 garlic cloves, crushed
1 large brown onion, thinly sliced
20 g butter
600 g beef rump steak, thinly sliced
1 tbsp. olive oil
250 g fettuccine