Seared Beef Tenderloin Mini Sandwiches with Mustard-Horseradish Sauce

Ingredients

• Cooking spray
• ½ teaspoon freshly ground black pepper
• 1 (1 1/2-pound) beef tenderloin, trimmed
• 2 tablespoons prepared horseradish
• 2 tablespoons minced fresh tarragon
• ¼ cup Dijon mustard
• ²/₃ cup fat-free sour cream
• + 5 more ingredients
• • ½ cup (2 ounces) shaved fresh Parmesan cheese
  • 1 (8-ounce) French bread baguette, cut diagonally into 16 slices
  • 3 cups trimmed watercress (about 1 bunch)
  • 2 tablespoons fresh lemon juice
  • 2 tablespoons capers

Combine first 4 ingredients, stirring well with a whisk. Cover and chill. Secure beef at 2-inch intervals with twine. Sprinkle beef with pepper. Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add beef to pan; cook 15 minutes or until desired degree of doneness, ...

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