This recipe combines the comforting flavors of tomato soup with the savory goodness of roast beef, cheddar cheese, and horseradish in a delicious panini. The tomato soup is rich and creamy, while the roast beef adds a hearty and meaty element. The cheddar cheese provides a melty and gooey texture, and the horseradish adds a tangy and slightly spicy kick. When combined in a panini, these flavors create a satisfying and comforting meal that is perfect for lunch or dinner.