Horseradish-Crusted Salmon with Crispy Leeks

Preheat oven to 425°F. Line a rimmed baking sheet with foil.

Pat salmon dry and place on the prepared baking sheet. Sprinkle with 1/4 teaspoon each salt and pepper. Mix mayonnaise and horseradish in a small bowl and brush over the salmon. Roast until the salmon is opaque in the center, 7 to 10 minutes.

Meanwhile, heat oil in a large skillet over medium-high heat. Toss leek with cornstarch and add to the pan. Cook, separating the leek strands with tongs as they cook, until crispy and golden brown, 5 to 8 minutes. Transfer to a paper-towel-lined plate and sprinkle with the remaining 1/4 teaspoon each salt and pepper. Serve the salmon topped with the leek.