Ingredients
600g fillet steak
2 tbsp vegetable oil
1 large sliced onion
300g sliced mushrooms
3 tbsp butter
2 tbsp flour
2 cups beef broth or prepared stock
1 tbsp Dijon mustard
150ml sour cream
Salt and pepper
Chopped parsley, for garnish
Method
Season steak strips with salt and pepper.
Heat 2 tbsp oil in a large skillet over high heat and brown meat. Remove onto a plate when meat is browned.
Turn heat down to medium-high. Add butter, melt. Then add onions, cook for 1 minute, then add mushrooms.
Cook mushrooms until golden. Scrape bottom of the fry pan to get all the golden bits loose.
Add flour, cook, stirring, for 1 minute.

Stir, then add sour cream and mustard. Stir until incorporated (don't worry if it looks split, sour cream will "melt" as it heats).
Bring to simmer, then reduce heat to medium-low. Once it thickens to the consistency of pouring cream (3 - 5 minutes), adjust salt and pepper to taste.
Add beef back in. Simmer for 1 minute, then remove from stove immediately.
Serve over pasta, basmati rice or egg noodles, sprinkled with parsley if desired.
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