INGREDIENTS
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2/3 cup fat-free sour cream
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1/4 cup Dijon mustard
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2 tablespoons minced fresh tarragon
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2 tablespoons prepared horseradish
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1 (1 1/2-pound) beef tenderloin, trimmed
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1/2 teaspoon freshly ground black pepper
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Cooking spray
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2 tablespoons fresh lemon juice
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3 cups trimmed watercress (about 1 bunch)
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1 (8-ounce) French bread baguette, cut diagonally into 16 slices
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2 tablespoons capers
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1/2 cup (2 ounces) shaved fresh Parmesan cheese