Velvet-Sauced Beef Stroganoff

Pat the sirloin strips completely dry with paper towels and season on all sides with the salt and pepper. Thorough drying is the key to a sear rather than a steam.

Heat 2 tablespoons of the vegetable oil in a large skillet over high heat until the oil just begins to shimmer. Working in two batches to avoid crowding, sear the beef strips for about 1 minute per side until browned but still pink in the center. Transfer to a plate and set aside. The beef will finish cooking in the sauce later.

Reduce the heat to medium-high. Add the remaining 1 tablespoon of oil and 1 tablespoon of butter to the skillet. Add the sliced mushrooms in a single layer and cook undisturbed for 3 to 4 minutes until they develop a golden-brown sear on the bottom. Stir and continue cooking for another 2 to 3 minutes until tender and deeply browned.

Add the sliced onion and cook for 3 to 4 minutes, stirring occasionally, until softened and lightly caramelized at the edges. Add the garlic and cook for 30 seconds until fragrant.

Push the vegetables to the edges of the skillet and add the remaining 2 tablespoons of butter to the center. Once melted, sprinkle in the flour and stir to form a paste. Cook the roux for 1 minute, stirring constantly, to eliminate the raw flour taste.

Add the tomato paste and stir for 30 seconds until it darkens slightly and becomes fragrant. Pour in the white wine and scrape up any browned bits from the bottom of the pan. Let the wine simmer for 1 minute until mostly evaporated.

Pour in the beef broth while whisking to prevent lumps. Stir in the Worcestershire sauce and Dijon mustard. Bring the sauce to a steady simmer and cook for 4 to 5 minutes until it thickens enough to coat the back of a spoon.

While the sauce simmers, bring a large pot of salted water to a rolling boil. Cook the egg noodles according to package directions until al dente. Drain and toss with a small pat of butter to prevent sticking.

Remove the skillet from the heat and let it cool for 1 full minute. Stir in the sour cream until completely smooth and incorporated. This off-heat step is critical — adding sour cream to a boiling sauce will cause it to curdle.

Return the seared beef strips and any accumulated juices to the skillet. Gently fold them into the sauce and place the skillet back over low heat for 1 to 2 minutes, just until the beef is warmed through. Do not let the sauce boil.

Serve the stroganoff immediately over the buttered egg noodles, garnished generously with fresh chives.