When you strain the liquid in the cooker, set some of it aside. If the meat seems a little dry, stir some of the liquid back in.
Make up a plate of condiments, including red onion rings, tomato slices and Cheddar and Swiss cheese, so diners can dress their own sandwiches. Don’t forget the ketchup, mustard and pickle relish, too!
Make this recipe the day before your gathering and put it in the fridge. Reheat it on the stove just before serving.
The meat mixture will hold on your slow cooker's low heat setting up to 2 hours, with occasional stirring.