Southern Meatloaf Sandwiches

"The base for these Southern Meatloaf Sandwiches is our version of meatloaf, but feel free to substitute in your version instead. The real game begins when we slice up that meatloaf and transform it into sandwich royalty. I prefer using sourdough bread for meatloaf sandwiches as sourdough (1) is hearty enough to stand up to a big sandwich and (2) has a nice tart flavor that works well with the classic sweet ketchup topping on meatloaf. Add some mozzarella cheese and some crispy fried onions, and you’ve got all of the textures and flavors for a sandwich of legends!"