Beef Tenderloin and Caramelized Onion Sandwiches Recipe - Pillsbury.com

Ingredients

• 1 teaspoon salt
• 1/4 teaspoon garlic powder
• 1/4 teaspoon paprika
• 1/4 teaspoon coarse ground black pepper
• 1 (1-lb.) beef tenderloin, trimmed
• 3 tablespoons butter
• 1 tablespoon oil
• 2 tablespoons brown sugar
• 3 medium onions, cut into 1/4-inch-thick slices
• 2 tablespoons dry red wine or water
• 1/2 cup sour cream
• 1 tablespoon purchased horseradish sauce
• 1 (10-inch) round loaf focaccia (Italian flat bread)
• 1 1/2 cups firmly packed baby spinach leaves
• Cocktail toothpicks