Ingredients
Method
Roast the Brussels Sprouts
- Preheat your oven to 425°F. Trim and halve the Brussels sprouts, toss with olive oil, salt, and cracked black pepper. Spread cut-side down on a sheet pan and roast for 12 to 15 minutes until caramelized and tender at the edges. Set aside.
Make the Sweet Potato Purée
- Peel and cube the sweet potatoes into 1-inch pieces. Boil in salted water until fork-tender, about 15 to 18 minutes. Drain and return to the pot over low heat for 1 minute to steam off excess moisture. Transfer to a blender (not a food processor or hand mixer — a blender gives the silky, restaurant-style smooth).
- Over low heat, stir in the cold butter one tablespoon at a time until fully incorporated. Add the warm heavy cream a little at a time until the purée is silky and smooth. Stir in the brown sugar and nutmeg. Season with salt and white pepper.
Adding butter cold and one tablespoon at a time creates a stable emulsion. If you dump in warm butter all at once the fat separates and the purée turns greasy. Low heat, patience, one piece at a time.
Sear the Filet Mignon
- Pull the filets from the refrigerator 30 to 45 minutes before cooking. Pat completely dry with paper towels. Season generously with kosher salt and cracked black pepper on all sides.
- Heat a stainless or heavy skillet over high heat until smoking. Add the neutral oil. Sear the filets for 3 to 4 minutes per side without moving them.
- Reduce heat to medium, add the butter, garlic cloves, and thyme sprigs. Tilt the pan and baste the filets continuously for 1 to 2 minutes. For medium-rare, pull at 125°F internal. Remove from the pan and rest on a wire rack for 8 to 10 minutes so carryover finishes the cook without pushing past medium-rare.
Bringing the meat to room temperature is not just a chef habit. It means the center reaches temperature at the same rate as the outside, giving you an even cook from edge to edge, not a gray band around a pink center.
Resist the urge to move or check the filet. A proper crust only forms from sustained contact with the pan. If it sticks when you try to flip, it is not ready. Give it another 30 seconds.
Build the Apple-Brandy Glaze
- Discard excess fat from the pan but keep the fond. Reduce heat to medium. Add the butter and sauté the shallot for 2 to 3 minutes until softened. Add the diced apple and cook for another 2 minutes.
- Carefully add the brandy (it may flame briefly) and let it reduce by half, about 1 minute. Add the demi-glace or beef stock. Simmer for 6 to 8 minutes until the sauce thickens and coats a spoon.
- Stir in the thyme leaves and Dijon mustard. Taste and adjust salt and pepper.
If the brandy flames, do not panic. Let it burn off naturally. It goes out on its own in seconds and the alcohol cooks off completely. Stand back, do not cover the pan, and let it do its thing.
Plate and Serve
- Quenelle the sweet potato purée to one side of each plate using two large spoons. Set the rested filet against the purée, seared crust facing the diner. Arrange the Brussels sprouts opposite the filet at 8 o'clock, cut-side up. Spoon the apple brandy glaze over the meat in a slow ribbon, not pooled. Finish with a few watercress leaves on top of the filet. Serve immediately.
Notes
Plating: Rest the filet 8 to 10 minutes. Sweet potato puree quenelled to one side of the plate with two large spoons. Filet set against the puree, seared crust facing the diner. Apple brandy glaze spooned over the meat in a slow ribbon, not pooled. Brussels sprouts clustered opposite the filet at 8 o'clock, cut-side up. A few watercress leaves placed on top of the filet at the pass.
Wine: A full-bodied Cabernet Sauvignon or a Côtes du Rhône stands up to the brandy glaze.
Prep ahead: The apple brandy glaze can be made 1-2 days ahead and reheated gently. The sweet potato purée can also be made ahead and reheated with a splash of warm cream.
Scaling for service: To 8: double the steaks but only 1.5x the apple brandy glaze. It reduces faster in larger volume. Sear in two batches and hold finished steaks loosely tented with foil at room temperature, 8 minutes max before slicing. Never use a warm oven to hold — even 200°F pushes past medium-rare in minutes. To 12: triple everything except the glaze (2.5x). Three sear batches, plate to order, garnish doubled, purée held warm with a splash of cream stirred in right before plating.
Dietary swaps: GF as written. Not easily dairy-free. The sweet potato puree, the glaze (butter-mounted), and the pan sear all depend on butter. If you have to, sub olive oil for the butter in the sear, finish the glaze with a spoon of olive oil instead of butter off-heat, and use warm stock plus olive oil in the puree. The textures shift and the glaze loses its shine, but it still works. Nut-free as written.