An easy sandwich to put together but the flavors will make it seem as if you spent all day making it! The caramelized onions bring a sweet and unique flavor that helps make this sandwich irresistible! Get this caramelized onion, mushroom, and swiss cheese
mozzarella cheese, tomato, olive oil & home-made pesto sandwiches. **just made these for dinner and they were amazing, full of flavor. Next time I will make them using the panini maker rather than as a grilled cheese.