This recipe is a unique twist on a classic grilled cheese sandwich. The sandwich is made with sourdough bread, sliced avocado, and a mixture of cheddar and Monterey Jack cheese. The key lime juice is added to the cheese mixture, giving it a tangy and citrusy flavor. The sandwich is then grilled until the cheese is melted and the bread is crispy. The key lime juice adds a refreshing and zesty flavor to the sandwich, making it perfect for a quick and easy dinner.