To create Gordon Ramsay Beef Stroganoff, follow these straightforward steps:

1. Prepare the Ingredients: Begin by slicing the beef fillet into thin strips and chopping the onions and garlic.
2. Heat the Oil: In a large skillet, heat the olive oil over medium-high heat.
3. Cook the Beef: Add the beef strips to the skillet and season with salt and pepper. Sear the beef for 2-3 minutes until browned, then remove it from the skillet and set aside.
4. Sauté Onions and Garlic: In the same skillet, add onions and garlic. Sauté for about 2 minutes until the onions become translucent.
5. Add Mushrooms: Stir in the sliced mushrooms and cook until they are golden brown and tender, about 5-7 minutes.
6. Incorporate Beef Broth: Stir in the Dijon mustard and Worcestershire sauce followed by the beef broth. Bring the mixture to a gentle simmer.
7. Return Beef to the Skillet: Return the seared beef to the skillet, allowing it to cook through in the sauce for another 5 minutes.
8. Mix in Sour Cream: Reduce the heat to low and stir in the sour cream until well combined. Allow it to heat without boiling.
9. Adjust Seasoning: Taste and adjust the seasoning with salt and pepper as needed.
10. Prepare for Serving: Remove from heat and sprinkle with fresh chopped parsley for garnish.

These easy steps will guide you through creating this incredible Gordon Ramsay Beef Stroganoff, ensuring a delicious result every time.