Beef Tenderloin with Marsala without bourbon stuffing ketchup sugar juice

1 (6 lb) beef tenderloin , trimmed of fat 1/2 cup apple cider vinegar 2 tablespoons sea salt 2 tablespoons black pepper 2 teaspoons garlic powder 2 teaspoons[...]

1 cup sour cream 1/4 cup mayonnaise 5 tablespoons prepared horseradish 4 tablespoons Dijon mustard 2 tablespoons chopped fresh parsley 2 tablespoons[...]

1 (8 ounce) carton nonfat sour cream 1/4 cup minced fresh Italian parsley 1/4 cup prepared horseradish 1 teaspoon white wine worcestershire sauce 1/8 teaspoon[...]

4 beef tenderloin steaks , cut 1 inch thick (about 6 oz. each) 1/2 cup uncooked lentils 1/2 cup water 2 cups ready-to-serve beef broth , divided 1 teaspoon[...]