Fire up your grill or break out your stovetop grill pan and make these delicious grilled veggie sandwiches. Made with toasted ciabatta bread, fresh vegetables, mushrooms, and onions and topped with creamy feta cheese and a tangy garlic-lemon aioli, these open-faced sandwiches are packed with flavor. Quick and easy to make in just 20 minutes, you can grill them outdoors or use a grill pan indoors so enjoy them any time of year. Perfect for a healthy lunch, hearty appetizer or light dinner…