I use up leftovers mostly by taking them to work for lunch. DH isn't too fond of leftovers so I end up eating most of them, unless I can hide them in something else the second day.
LOL!! Hiding them in something the next day!! Men are so fussy.
Make a large roast and you can recyle it for him in meat salads, fajitas and or tacos, add BBQ sauce for sandwiches, use a different type of sauce for another meal - see when he realizes its actually leftovers! A friend of ours made a meatloaf (traditional with the brown sugar and ketchup on top) and her family won't eat leftovers. She made a huge one! The next day she broke up the meat and added BBQ sauce and ketchup for sloppy joes. The day after she made tacos and taco salads and a taco appetizer breaking up the meat and adding taco seasoning mix and water to heat through. She had some for the freezer that she used for loosemeat sandwiches, Impossible pies and chunked some for a ground beef pot pie! No one knew what she did!