Turn leftover roast beef and gravy into a quick and easy family dinner. These toasted beef and cheese sandwiches will satisfy even the heartiest appetites in less than 30 minutes.
In a large skillet, heat pot roast and gravy over medium heat until heated through, about 3 minutes; thin gravy with a few tablespoons of water, if necessary.
Spread toast out on a broiler pan. Divide pot roast slices evenly among toast. Spoon most of the gravy over the meat, and top each sandwich with a slice of cheddar cheese. Spoon any remaining gravy over cheese, then top with a few jalapeño slices.
Broil 1 minute, until cheese is melted. Serve with fries and cole slaw, if desired.