This Guinness and onion soup with Irish cheddar crouton is a hearty and flavorful soup that is perfect for St. Patrick's Day or any cozy evening. The rich and caramelized onions are cooked in a combination of Guinness beer and beef broth, giving the soup a deep and robust flavor. The Irish cheddar crouton adds a delicious cheesy crunch to every bite. Serve this soup with a side of crusty bread for a complete meal.