2 tablespoons prepared horseradish
1 tablespoon extra-virgin olive oil
1 teaspoon Dijon mustard
2 pounds trimmed beef tenderloin, preferably center-cut
1 teaspoon kosher salt
2 teaspoons freshly ground pepper
Creamy Horseradish Sauce (recipe follows):
1 1/4 cups reduced-fat sour cream
1/3 cup prepared horseradish
1 teaspoon kosher salt
1 teaspoon freshly ground pepper
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