Filet Mignon w/ Lobster Thermidor Sauce and Truffle Mashed Potates
For the Steak:
- 2 filet mignon steaks (6-8 oz each) 
- 1 tbsp olive oil 
- 2 tbsp unsalted butter 
- 2 cloves garlic (crushed) 
- 1 sprig rosemary 
- 1 sprig thyme 
- Salt & freshly ground black pepper 
For the Lobster Thermidor Sauce:
- 2 cooked lobster tail (shell removed, chopped into bite-sized pieces) 
- 1 tbsp unsalted butter 
- 1 small shallot (finely diced) 
- 1 clove garlic (minced) 
- ¼ cup dry white wine (Chardonnay or Sauvignon Blanc) 
- ½ cup heavy cream 
- 1 tbsp Dijon mustard 
- ¼ cup Gruyère cheese (shredded) 
- 1 tbsp Parmesan cheese 
- 1 tsp lemon juice 
- ½ tsp paprika 
- Salt & pepper to taste 
- 1 tbsp fresh parsley (chopped, for garnish) 
For the Truffle Mashed Potatoes:
- 2 medium Yukon Gold potatoes (peeled and diced) 
- 2 tbsp unsalted butter 
- ¼ cup heavy cream 
- 1 tsp truffle oil 
- Salt & white pepper to taste 
Cooking Instructions (20 Minutes Total)
Step 1: Prepare the Truffle Mashed Potatoes (10 minutes)
- Boil the potatoes in salted water until fork-tender (about 10 minutes). 
- Drain and mash with butter and heavy cream until smooth. 
- Stir in truffle oil, salt, and white pepper to taste. 
- Cover and keep warm while you cook the steak and lobster sauce. 
Step 2: Cook the Filet Mignon (6 minutes)
- Pat the steaks dry with paper towels and season generously with salt and black pepper. 
- Heat olive oil in a pan over medium-high heat until shimmering. 
- Sear the steaks for 3 minutes on each side (for medium-rare). 
- Add butter, crushed garlic, and rosemary/thyme to the pan. 
- Tilt the pan and baste the steak by spooning the melted butter over it for 30 seconds. 
- Remove the steaks from heat and let them rest while making the lobster sauce. 
Step 3: Make the Lobster Thermidor Sauce (5 minutes)
- In the same pan, melt butter over medium heat and sauté shallots & garlic until fragrant. 
- Deglaze the pan with white wine, letting it reduce by half (about 1 minute). 
- Stir in heavy cream, Dijon mustard, paprika, Gruyère, and Parmesan cheese, mixing until smooth. 
- Add the chopped lobster meat, lemon juice, and salt & pepper to taste. 
- Simmer for 1-2 minutes until the sauce thickens slightly. 
Step 4: Plating & Presentation
- Spoon truffle mashed potatoes onto each plate. 
- Place the filet mignon on top and drizzle with Lobster Thermidor sauce. 
- Garnish with fresh parsley and extra Parmesan. 
