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1) Prepare Ingredients: Preheat oven to 450 degrees. Rinse steak and pat dry with paper towel. Rinse spinach. Thinly slice garlic. Zest lemon, then halve. Peel shallot and thinly slice.
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2) Bake Frites: Rinse potatoes and halve lengthwise. Cut into 1/4 inch planks, then cut each into 1/4-inch wide fries. On a baking sheet, toss potato with 1 1/2 tbsp olive oil, salt, and pepper. Bake until crisp on outside and tender inside (about 20-25 mins).
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3) Sear Steak: While frites bakes, heat 1/2 tbsp olive oil in a large pan over medium-high heat. Season steak on both sides with salt & pepper. When oil is shimmering, add steak and sear until browned on outside and medium rare (2-3 mins per side). Remove steak from pan, reserving any juices, and set aside to rest for at least 5 mins.
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4) Cook Sauce: Add shallot to pan from steak over medium heat. Cook until soft (about 3 mins). Add white wine and cook until reduced slightly (about 1 min). Add mustard, horseradish, and sour cream. Stir to combine. Cook until warmed through (about 1 min). Taste and add salt & pepper as needed. Remove pan from heat and set aside.
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5) Cook Spinach: While sauce cooks, heat 1 tbsp olive oil in a separate large pan over medium heat. When oil is shimmering, add garlic & cook until fragrant (about 30 secs). Add spinach and 1 squeeze of lemon juice. Cook until wilted (1-2 mins). Stir in zest. Taste and add salt & pepper as needed. Remove pot from heat.
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6) Serve: Plate the steak, frites, and spinach. Spoon white wine sauce over steak and serve.
