Coat a large skillet with olive oil and place over medium heat. When hot, add the fillets to the pan skin side down; season with salt and pepper. Cook for 5 minutes until the skin is nice and brown. Turn the fish over and cook for 3 minutes on the other side. Keep warm while preparing the sauce.
In a small bowl whisk together sour cream, dill, lemon juice, shallot, red pepper flakes and horseradish. Season with salt and pepper. Serve the sauce over the pan-seared salmon.
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