Pat salmon dry and coat with salt and pepper.
In a heavy skillet (preferably cast iron) heat 1 tablespoon of oil over moderately high heat until hot but not smoking and sear salmon, skin side down, 5 minutes.
Reduce heat to moderately low.
Turn salmon and cook 4 minutes more, or until it just flakes.
While salmon is cooking, in a small bowl whisk together vinegar, mustard,horseradish, remaining 2 tablespoons oil, and salt and pepper to taste until emulsified.
Serve vinaigrette over salmon.
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