1 1 / 2 lb (680 g) baby Yukon gold potatoes, scrubbed 1 tbsp kosher salt (for boiling water) 3 tbsp olive oil 1 / 2 tsp kosher salt (for seasoning) 1 / 2 tsp freshly ground black pepper 2 tbsp prepared horseradish (not creamy) 1 tsp Dijon mustard 1 tbsp red wine vinegar 1 tbsp fresh lemon juice 1 tsp honey 1 / 4 cup (60 ml) extra-virgin olive oil 2 tbsp finely chopped fresh chives 1 tbsp finely chopped fresh parsley 1 / 2 tsp lemon zest
Heat oven to 450°F and position a rack in the middle. Place potatoes in a pot, cover with cold water by 1 inch, add 1 tablespoon kosher salt, and bring to a boil. Simmer until just fork-tender, 15–18 minutes. Drain and let steam-dry 5 minutes. Spread potatoes on a rimmed baking sheet. Use the bottom of a glass to gently smash each to about 1/2-inch thick. Drizzle with 3 tablespoons olive oil and season with 1/2 teaspoon kosher salt and 1/2 teaspoon black pepper. Roast 20–25 minutes, flipping halfway, until deeply golden and crisp. Meanwhile, make the vinaigrette: In a bowl, whisk horseradish, Dijon, red wine vinegar, lemon juice, and honey with a pinch of salt and pepper. Slowly whisk in 1/4 cup extra-virgin olive oil until emulsified, then stir in chives, parsley, and lemon zest. Transfer hot potatoes to a bowl or platter and drizzle with enough vinaigrette to coat (you may have a little left over). Toss gently, taste, and adjust seasoning. Serve immediately alongside the steak.
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