Seared Beef Tenderloin Mini Sandwiches with Mustard-Horseradish Sauce Recipe - Details, Calories, Nu

Ingredients

• 2/3 cup fat-free sour cream
• 1/4 cup dijon mustard
• 2 tbsp minced fresh tarragon
• 2 tbsp prepared horseradish
• 1 (1 1/2-lb) beef tenderloin, trimmed
• 1/2 tsp freshly ground black pepper
• cooking spray
• 2 tbsp fresh lemon juice
• 3 cups trimmed watercress (about 1 bunch)
• 1 (8-oz) french bread baguette, cut diagonally into 16 slices
• 2 tbsp capers
• 1/2 cup (2 oz) shaved fresh parmesan cheese