Porterhouse Steak with Horseradish Sauce

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One 1 1/2-pound porterhouse steak

1 teaspoon kosher salt 

1 teaspoon freshly cracked black pepper 

2 tablespoons vegetable oil 

1/4 cup sour cream 

3 tablespoons mayonnaise 

2 tablespoons prepared horseradish 

1 teaspoon Worcestershire sauce 

2 tablespoons fresh parsley, chopped