Beef Tenderloin Canapés with Mustard-Caper Sauce Recipe

Ingredients

• 1 (2 to 2 1/2-lb.) beef tenderloin, trimmed
• 1 tablespoon olive oil
• 1/2 teaspoon salt
• 1/2 teaspoon cracked black pepper
• 1/2 cup mayonnaise
• 5 tablespoons finely chopped green onions
• 2 tablespoons drained capers
• 2 tablespoons Dijon mustard
• 1 tablespoon purchased creamy horseradish sauce
• 36 slices baguette-style or small French bread
• Radicchio and/or watercress leaves