French Dip Steak Sandwiches with Horseradish Sauce

Name: French Dip Steak Sandwiches with Horseradish Sauce
Ingredients: 1/2 cup sour cream; 3/4 teaspoon prepared horseradish; 1 teaspoon salt; 1/4 teaspoon freshly cracked black pepper; 1 1/2 cups French onion soup; 1 1/2 cups beef broth; 1/2 teaspoon granulated sugar; 2 teaspoons Worcestershire sauce, plus more to taste; 1/8 teaspoon salt, plus more to taste; Freshly cracked black pepper; Olive oil, for the grill pan; 1 boneless rib-eye steak (about 8 ounces, 1-inch thick); Salt and freshly ground black pepper; 2 small baguettes, split in half lengthwise