Grilled Rosemary Steak Sandwiches are a delicious and satisfying meal. Tender and juicy steak is marinated in a flavorful rosemary and garlic marinade, then grilled to perfection. The steak is thinly sliced and served on a crusty baguette with caramelized onions, melted provolone cheese, and a tangy horseradish mayo. The combination of the savory steak, fragrant rosemary, and creamy horseradish mayo creates a mouthwatering sandwich that is sure to impress.