Leftover Pot Roast Patty Melts are a delicious and easy way to repurpose leftover pot roast. The tender and flavorful pot roast is shredded and combined with caramelized onions, melted cheese, and tangy Thousand Island dressing. The mixture is then sandwiched between slices of rye bread and grilled until golden and crispy. These patty melts are the perfect comfort food, with a combination of savory flavors and a satisfying crunch. Serve them with a side of pickles or coleslaw for a complete and hearty meal.