Spring leek soup with Gruyere toasts is a light and flavorful soup that celebrates the fresh flavors of spring. The soup is made with tender leeks, potatoes, and chicken broth, which are simmered until the vegetables are soft and the flavors have melded together. The soup is then pureed until smooth and served with crispy Gruyere toasts on the side. The combination of the creamy soup and the cheesy toasts creates a delicious and satisfying meal.