Grilled Meatloaf Sandwiches are the perfect way to make use of leftover meatloaf. No matter which of my meatloaf recipes that I make. I always try to ration the meatloaf so that we will have enough leftover meatloaf so I can make Meatloaf sandwiches. We love meatloaf sandwiches, and Grilled Meatloaf Sandwiches with bread that’s been spread with Garlic Parmesan Butter is amazingly delicious.