Our New York strip steak has such a deep, rich, and gloriously meaty flavor that it could be a stand-alone dish with little more than salt and pepper for seasoning. But we’re still adding some top-notch sides and a full-bodied sauce to this recipe so that it soars above and beyond. Ultra-creamy mashed potatoes and tender roasted carrots make it filling and hearty, while the mushroom pan sauce that’s spooned on top has savory complexity.
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Yukon Gold Potatoes
Adjust rack to top position and preheat oven to 425 degrees. Wash and dry all produce. Halve, peel, and thinly slice onion. Mince garlic. Trim, peel, and cut carrots on a diagonal into 1-inch-thick pieces. Trim and thinly slice mushrooms. Peel and dice potatoes into ½-inch pieces. TIP: For speedier spud prep, skip the peeling.
Toss carrots on a baking sheet with a large drizzle of oil, salt, and pepper. Roast until browned and tender, 25-30 minutes. Meanwhile, place potatoes in a medium pot with enough salted water to cover by 2 inches. Bring to a boil; cook until tender, 15-20 minutes. Drain and return potatoes to pot. Mash with sour cream until smooth. Season with salt and pepper. Keep covered off heat until ready to serve.
While potatoes cook, heat a large drizzle of oil in a large, preferably nonstick, pan over medium-high heat. Add onion and cook, stirring occasionally, until browned and softened, 8-10 minutes. Add 1 tsp sugar and a splash of water; cook until caramelized, 2-3 minutes more. Season with salt and pepper. Turn off heat; transfer to a small bowl. Wipe out pan.
Pat steak dry with paper towels; season with salt and pepper. Heat a large drizzle of oil in pan used for onion over medium-high heat. Add steak and cook to desired doneness, 5-7 minutes per side. Transfer to a cutting board to rest.
Add 1 TBSP butter and mushrooms to pan used for steak over medium-high heat. Cook, stirring, until softened, 3-5 minutes. Add garlic and cook until fragrant, 30 seconds. Stir in demi-glace and ¼ cup water (⅓ cup water for 4 servings). Bring to a boil, then reduce to a simmer. Stir in mustard. Simmer until thickened, 2-3 minutes. Season with salt and pepper.
Slice steak against the grain. Divide potatoes, carrots, and steak between plates. Top potatoes with caramelized onion. Top steak with mushroom sauce and serve.