01 -
600g/1.2lb scotch fillet steak or boneless rib eye.
02 -
2 tablespoons vegetable oil, divided.
03 -
1 large onion, sliced.
04 -
300g/10oz mushrooms, sliced.
05 -
40g/3 tablespoons butter.
06 -
2 tablespoons flour.
07 -
2 cups beef broth.
08 -
1 tablespoon Dijon mustard.
09 -
150ml/2/3 cup sour cream.
10 -
Salt and pepper to taste.
11 -
250-300g pasta or egg noodles.
12 -
Chopped chives for garnish (optional).