Searing and baking the salmon without turning it results ina crisp top and a soft horseradish coating on the underside.
Preheat oven to 375 degrees. Season both sides of salmon fillets with salt and pepper. Spread 1 tablespoon horseradish onto skinned side of each fillet.
Heat oil in a large ovenproof skillet over high heat untilhot but not smoking. Add salmon, horseradish side up,and sear on 1 side, about 2 minutes. Without flipping fish,transfer skillet to oven, and bake until salmon has cookedthrough, about 6 minutes. Transfer salmon to a platter, flippingfish, and sprinkle with scallions.